Sealing mechanism and guide vane end face made of novel material

Abstract

The utility model relates to the technical field of guide vane end face sealing, and discloses a sealing mechanism and a novel material guide vane end face. And the sealing unit comprises a positioning groove formed in the bottom ring, a sealing assembly arranged on the positioning groove and a fastening assembly arranged on one side of the sealing assembly. The sealing mechanism solves the problem that in the operation process of a water turbine, due to factors such as washing of water flow containing silt, cavitation and long-term operation, a copper bar for sealing the end face of a guide vane is rusted, and the sealing effect is affected. Meanwhile, the guide vane end face made of the novel material solves the problem that in the overhauling process, a rusted area sealed by a copper bar needs to be removed, and the workload during overhauling is greatly increased.

Description

Technical Field

[0001] The utility model relates to the technical field of guide vane end face sealing, in particular to a sealing mechanism and a guide vane end face made of a new material. Background Art

[0002] The guide vane end faces on a hydro-turbine generator set are important components of the guide vanes. They are in direct contact with the water flow and control the way the water flows into and out of the runner.

[0003] The main function of the guide vane end face is to guide the water flow into the runner at an appropriate speed and direction. The geometric shape and position of the guide vane end face determine the flow characteristics of the water flow. During the operation of the turbine, the guide vane end face will be subjected to the dynamic load of the water flow, including impact force and vibration. The guide vane end face needs to fit closely with the runner and adjacent guide vanes to ensure good sealing and prevent water leakage.

[0004] The existing guide vane end face seal adopts an elastic compensation metal structure, which is arranged on the top cover and bottom ring corresponding to the upper and lower end faces of the movable guide vane, and adopts a segmented pressure plate type copper strip seal, and a rubber elastic block is arranged under the copper strip. However, during the operation of the unit, due to the scouring of sediment-containing water flow, cavitation, long-term operation of the unit, loss and other reasons, the copper strip of the guide vane end face seal rusts on a large area, thereby affecting the overall sealing effect. In addition, during the annual maintenance of the unit, the rusted area of ​​the copper strip seal needs to be cleared, which greatly increases the workload during maintenance, and the end face seal may also be damaged during the rust treatment process. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the problem in the prior art that during the operation of the turbine, the copper strips of the guide vane end face seal rust due to erosion by sediment-containing water flow, cavitation and long-term operation, which affects the sealing effect, the present utility model is proposed.

[0007] Therefore, the purpose of the utility model is to provide a sealing mechanism, the purpose of which is to solve the problem that the copper strips of the guide vane end face seal are rusted due to factors such as scouring of silt-containing water flow, cavitation and long-term operation during the operation of the turbine, thereby affecting the sealing effect.

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions: a sealing mechanism, comprising:

[0009] a positioning unit, comprising a bottom ring; and,

[0010] The sealing unit comprises a positioning groove arranged on the bottom ring, a sealing component arranged on the positioning groove, and a fastening component arranged on one side of the sealing component.

[0011] As a preferred solution of the sealing mechanism of the utility model, the sealing assembly includes a groove arranged on the bottom ring, an elastic strip arranged on the groove, a strip plate arranged on the elastic strip, and a roller rotatably arranged on the strip plate;

[0012] The rollers are arranged linearly on the strip plate, and the height of the strip plate is smaller than the height of the groove.

[0013] As a preferred solution of the sealing mechanism of the utility model, the sealing assembly further comprises a new material seal arranged on the positioning groove, an air bag arranged on one side of the new material seal, and a bag tube arranged on the air bag;

[0014] A rubber elastic block is arranged in the positioning groove.

[0015] As a preferred solution of the sealing mechanism described in the utility model, the fastening assembly includes a limit groove arranged on the bottom ring, a pressure block arranged on the limit groove, a bolt hole arranged on the pressure block, a positioning bolt arranged on the bolt hole, and a limit column arranged on the positioning bolt.

[0016] As a preferred solution of the sealing mechanism described in the utility model, wherein: a pressing plate is arranged on the bolt hole, a telescopic column is arranged on the pressing plate, a spring is arranged on the telescopic column, and a limiting hole is arranged on the telescopic column.

[0017] The beneficial effects of the utility model are as follows: through the cooperation of the sealing component and the fastening component, the sealing performance of the guide vane end face can be improved, the penetration of water and sediment can be reduced, and the new material seal is used to replace the copper seal, so as to solve the problem that the copper strip of the guide vane end face seal is rusted due to the erosion of sediment-containing water flow, cavitation and long-term operation during the operation of the turbine, thereby affecting the sealing effect.

[0018] In view of the problem in the prior art that during the maintenance process, the rusted area of ​​the copper strip seal needs to be cleared, which greatly increases the workload during maintenance, the present utility model is proposed.

[0019] Therefore, the utility model aims to provide a guide vane end face made of a new material, which aims to solve the problem that during the maintenance process, the rusted area of ​​the copper strip seal needs to be cleared, which greatly increases the workload during the maintenance.

[0020] As a preferred solution of the new material guide vane end surface described in the utility model, wherein: a new material guide vane end surface includes:

[0021] a flow channel unit, comprising a tailwater pipe arranged on the bottom ring, and a runner chamber arranged on the tailwater pipe; and,

[0022] The water guide unit comprises a guide vane arranged on the bottom ring, a bearing assembly arranged on the bottom ring, and a top ring assembly arranged at one end of the guide vane.

[0023] As a preferred solution for the guide vane end face made of a new material described in the utility model, the bearing assembly includes a support plate arranged on the bottom ring, a positioning ring arranged on the support plate, a positioning sleeve arranged on the positioning ring, and a bearing arranged on the positioning sleeve.

[0024] As a preferred solution for the new material guide vane end face described in the utility model, wherein: a positioning column one is movably connected to the bearing one, and one end of the positioning column one is arranged on the guide vane.

[0025] As a preferred solution for the end face of a guide vane made of a new material described in the utility model, the top ring assembly includes a top cover arranged on the guide vane, a second support plate arranged on the top cover, a second positioning ring arranged on the second support plate, a second positioning sleeve arranged on the second positioning ring, and a second bearing arranged on the second positioning sleeve.

[0026] As a preferred solution for the new material guide vane end face described in the utility model, wherein: a second positioning column is movably connected to the second bearing, and one end of the second positioning column is arranged on the guide vane.

[0027] The beneficial effects of the utility model are as follows: the positioning design of the bearing assembly and the top ring assembly helps to improve the stability of the guide vane during operation, reduce the penetration of water and mud, and make the removal and installation of the guide vane more convenient and quick, solving the problem of the need to clean the rusted area of ​​the copper strip seal during maintenance, which greatly increases the workload during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0029] Figure 1The utility model is a schematic diagram of the overall structure of a sealing mechanism.

[0030] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0031] Figure 3 The utility model is a schematic diagram of a fastening assembly structure of a sealing mechanism.

[0032] Figure 4 This is a schematic diagram of the overall structure of a guide vane end face made of a new material in the utility model.

[0033] Figure 5 This is a schematic diagram of the bottom ring structure of a guide vane end face made of a new material in the utility model.

[0034] Figure 6 This is a schematic diagram of the bottom ring and top cover structure of a guide vane end face made of a new material in the utility model. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] Example 1

[0040] Reference Figure 1 - Figure 3 , which is the first embodiment of the utility model, provides a sealing mechanism, the device comprising:

[0041] The positioning unit 100 comprises a bottom ring 101; and

[0042] The sealing unit 200 includes a positioning groove 201 disposed on the bottom ring 101, a sealing assembly 202 disposed on the positioning groove 201, and a fastening assembly 203 disposed on one side of the sealing assembly 202. The bottom ring 101 is used to position the rotating guide vane 401. The sealing assembly 202 realizes the sealing between the guide vane 401 on the bottom ring 101 and the bearing assembly 402.

[0043] The sealing assembly 202 includes a groove 202a provided on the bottom ring 101, an elastic strip 202b provided on the groove 202a, a strip plate 202c provided on the elastic strip 202b, and a roller 202d rotatably provided on the strip plate 202c; the rollers 202d are arranged linearly on the strip plate 202c, and the height of the strip plate 202c is less than the height of the groove 202a. The use of multiple rollers 202d increases the contact area between the rollers 202d and the surface of the new material seal 202e, which is helpful for the installation and removal of the new material seal 202e. The height of the strip plate 202c is less than the height of the groove 202a, which facilitates the strip plate 202c to squeeze the airbag 202f inside the groove 202a.

[0044] The sealing assembly 202 further includes a new material seal 202e disposed on the positioning groove 201, an airbag 202f disposed on one side of the new material seal 202e, and a bag tube 202g disposed on the airbag 202f; a rubber elastic block 202h is disposed in the positioning groove 201. The rubber elastic block 202h is used to fill the other space of the positioning groove 201 that is not completely filled by the new material seal 202e, so as to increase the sealing performance between the new material seal 202e and the positioning groove 201.

[0045] During use, when the staff installs the new material seal 202e on the groove 202a on the bottom ring 101, the new material seal 202e slides on the surface of the roller 202d, which facilitates the new material seal 202e to enter the groove 202a, thereby facilitating the installation and removal of the new material seal 202e.

[0046] During the installation process, the new material seal 202e squeezes the roller 202d and the strip plate 202c. Under the action of the elastic strip 202b, the airbag 202f will be squeezed, and the generated gas will enter the bag tube 202g. The bag tube 202g is in the gap in the vertical direction between the new material seal 202e and the positioning groove 201. With the use of the rubber elastic block 202h, the sealing between the new material seal 202e and the positioning groove 201 and the new material seal 202e and the groove 202a is increased, thereby reducing the penetration of water and mud.

[0047] This sealing mechanism is used on the bottom ring 101 and the top cover 403a. The new material sealing strip 202e is made of a polymer material, polyetheretherketone. Polyetheretherketone PEEK is synthesized with 4,4'-difluorobenzophenone, hydroquinone and sodium carbonate as raw materials and diphenol as solvent. It is a special polymer material with excellent comprehensive performance. This polymer material has high crystallinity, a melting point of 334°C, and a long-term use temperature of more than 240°C. In addition, it has excellent creep resistance and fatigue resistance, a small friction coefficient, high wear resistance, high temperature resistance, high mechanical strength and excellent electrical insulation. Except for concentrated sulfuric acid, it can withstand almost any chemical, has good sealing performance, a long life cycle, and is resistant to cavitation and erosion. The bag tube 202g and the airbag 202f also use this material.

[0048] The new material seal 202e breaks the limitation of traditional metal materials, mainly copper materials, for the end face seal of the guide vane 401, and applies the end face seal of the guide vane 401 made of organic polymer materials to the million-dollar hydro-turbine generator set, thereby improving the anti-cavitation and anti-scouring performance of the end face seal of the guide vane 401, solving the corrosion problem of the existing copper strip seal of the million-dollar hydro-turbine generator set, reducing the possibility of large amounts of water leakage from the upper and lower end faces of the active guide vane 401 of the turbine, and improving the sealing performance at the contact between the bottom ring 101, the top cover 403a and the guide vane 401, thus ensuring the safe operation of the hydro-turbine generator set.

[0049] Example 2

[0050] Reference Figure 1 - Figure 3 , which is the second embodiment of the utility model, and this embodiment is different from the first embodiment in that:

[0051] The fastening assembly 203 includes a limiting groove 203a provided on the bottom ring 101, a pressing block 203b provided on the limiting groove 203a, a bolt hole 203c provided on the pressing block 203b, a positioning bolt 203d provided on the bolt hole 203c, and a limiting column 203e provided on the positioning bolt 203d. The fastening assembly 203 realizes fixing the new material seal 202e on the bottom ring 101 through the pressing block 203b, thereby improving the sealing performance of the end surface of the guide vane 401 of the bottom ring 101.

[0052] Compared with the first embodiment, further, a pressing plate 203f is provided on the bolt hole 203c, a telescopic column 203g is provided on the pressing plate 203f, a spring 203h is provided on the telescopic column 203g, and a limit hole 203i is provided on the telescopic column 203g. The telescopic column 203g is designed to be telescopically inserted into the bottom ring 101, and under the elastic force of the spring 203h, the positioning bolt 203d exerts a greater pressure on the bolt hole 203c of the bottom ring 101, thereby enhancing its fastening force on the surface of the bolt hole 203c.

[0053] During use, after the operator installs the new material seal 202e, the operator uses the pressing block 203b to fix the new material seal 202e. The operator first fixes the pressing block 203b on the limiting groove 203a, and then installs the positioning bolt 203d in the bolt hole 203c. The bolt hole 203c extends to the bottom ring 101 through the pressing block 203b. The bolt hole 203c is divided into two parts, one on the pressing block 203b and the other on the bottom ring 101. The bolt holes 203c of the two parts are aligned, which is convenient for fixing the pressing block 203b on the bottom ring 101, thereby realizing the fixation of the new material seal 202e. The limiting column at one end of the positioning bolt 203d 203e will enter into the limiting hole 203i in the telescopic column 203g. When the positioning bolt 203d rotates in the bolt hole 203c, it will squeeze the pressing plate 203f and the telescopic column 203g. The telescopic column 203g can be telescoped into the bottom ring 101. Under the action of the spring 203h, the elastic force of the positioning bolt 203d increases the tension of the positioning bolt 203d on the surface of the bolt hole 203c on the bottom ring 101, so that the pressure block 203b is more firmly installed on the bottom ring 101, preventing the positioning bolt 203d from loosening during the operation of the generator wheel and reducing the sealing mechanism and sealing performance of the new material seal 202e.

[0054] The remaining structures are the same as those of Example 1.

[0055] Example 3

[0056] Reference Figure 1 - Figure 6 , which is the third embodiment of the utility model, which is different from the second embodiment in that: an end surface of a guide vane 401 made of a new material includes:

[0057] The flow channel unit 300 includes a tailwater pipe 301 disposed on the bottom ring 101, and a runner chamber 302 disposed on the tailwater pipe 301; and a water guide unit 400 includes a guide vane 401 disposed on the bottom ring 101, a bearing assembly 402 disposed on the bottom ring 101, and a top ring assembly 403 disposed at one end of the guide vane 401. The flow channel unit 300 is a part of the generator set runner designed to guide the water flow through, ensuring that the water flow can impact the runner blades in the most effective way. The water guide unit 400 is a component that controls the water flow into the runner.

[0058] Compared with Example 2, further, the bearing assembly 402 includes a support plate 402a disposed on the bottom ring 101, a positioning ring 402b disposed on the support plate, a positioning sleeve 402c disposed on the positioning ring 402b, and a bearing 402d disposed on the positioning sleeve 402c. The positioning ring 402b is used to position the positioning sleeve 402c on the support plate 402a. The support plate on the bottom ring 101 is used to support the two components of the bottom ring 101, the positioning sleeve 402c is used to provide space for the operation of the bearing 402d, and the bearing 402d is installed and connected with the positioning column 404 to facilitate the rotation of the guide vane 401 in the positioning sleeve 402c.

[0059] The bearing 1 402d is movably connected with a positioning column 1 404, and one end of the positioning column 1 404 is arranged on the guide vane 401. The positioning column 1 404 supports the guide vane 401 to rotate in the bearing 1 402d, thereby controlling the flow direction of the water flow.

[0060] The top ring assembly 403 includes a top cover 403a disposed on the guide vane 401, a second support plate 403b disposed on the top cover 403a, a second positioning ring 403c disposed on the second support plate 403b, a second positioning sleeve 403d disposed on the second positioning ring 403c, and a second bearing 403e disposed on the second positioning sleeve 403d. The second positioning ring 403c is used to position the second positioning sleeve 403d on the second support plate 403b. The support plate on the top cover 403a is used to support the two components of the top cover 403a, the second positioning sleeve 403d is used to provide space for the operation of the second bearing 403e, and the second bearing 403e and the second positioning column 405 are installed and connected to facilitate the guide vane 401 to rotate in the second positioning sleeve 403d.

[0061] The second bearing 403e is movably connected with a second positioning column 405, and one end of the second positioning column 405 is arranged on the guide vane 401. The second positioning column 405 supports the guide vane 401 to rotate in the second bearing 403e, thereby controlling the flow direction of the water flow.

[0062] During use, first, the wheel on the generator set will rotate in the impeller chamber 302, and the water will flow along the tailwater pipe 301. The support plate 1 402a and the support plate 2 403b are respectively used to support the positioning sleeve 1 402c and the positioning sleeve 2 403d on the bottom ring 101 and the top cover 403a. The positioning sleeve 1 402c and the positioning sleeve 2 403d are respectively used to support the rotation of the bearing 1 402d and the bearing 2 403e. The bearing 1 402d and the bearing 2 403e are respectively controlled by the positioning column 1 404 and the positioning column 2 405. The guide vane 401 set between the positioning column 1 404 and the positioning column 2 405 controls the flow rate and direction of the water entering the tailwater pipe 301.

[0063] The bottom ring 101 and the top cover 403a that support the guide vane 401 for rotation adopt a new material. The end face of the guide vane 401, the positioning design of the bearing assembly 402 and the top ring assembly 403 help to improve the stability of the guide vane 401 during operation, reduce the penetration of water and sediment, and make the disassembly and installation of the guide vane 401 more convenient and quick, and solve the problem of needing to clean the rusted area of ​​the copper strip seal during maintenance, which greatly increases the workload during maintenance.

[0064] The remaining structure is the same as that of Example 2.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A sealing mechanism, characterized in that: include, A positioning unit (100) comprising a bottom ring (101); and The sealing unit (200) comprises a positioning groove (201) arranged on the bottom ring (101), a sealing component (202) arranged on the positioning groove (201), and a fastening component (203) arranged on one side of the sealing component (202).

2. The sealing mechanism according to claim 1, characterized in that: The sealing assembly (202) comprises a groove (202a) arranged on the bottom ring (101), an elastic strip (202b) arranged on the groove (202a), a strip plate (202c) arranged on the elastic strip (202b), and a roller (202d) rotatably arranged on the strip plate (202c); The rollers (202d) are arranged linearly on the strip plate (202c), and the height of the strip plate (202c) is smaller than the height of the groove (202a).

3. The sealing mechanism according to claim 2, characterized in that: The sealing assembly (202) further comprises a new material seal (202e) arranged on the positioning groove (201), an air bag (202f) arranged on one side of the new material seal (202e), and a bag tube (202g) arranged on the air bag (202f); A rubber elastic block (202h) is arranged in the positioning groove (201).

4. The sealing mechanism according to claim 3, characterized in that: The fastening assembly (203) comprises a limiting groove (203a) arranged on the bottom ring (101), a pressing block (203b) arranged on the limiting groove (203a), a bolt hole (203c) arranged on the pressing block (203b), a positioning bolt (203d) arranged on the bolt hole (203c), and a limiting column (203e) arranged on the positioning bolt (203d).

5. The sealing mechanism according to claim 4, characterized in that: A pressing plate (203f) is arranged on the bolt hole (203c), a telescopic column (203g) is arranged on the pressing plate (203f), a spring (203h) is arranged on the telescopic column (203g), and a limiting hole (203i) is arranged on the telescopic column (203g).

6. A new material guide vane (401) end surface, characterized in that: The sealing mechanism comprises any one of claims 1 to 5, further comprising: A flow channel unit (300) comprises a tailwater pipe (301) arranged on the bottom ring (101), and a runner chamber (302) arranged on the tailwater pipe (301); and, The water guide unit (400) comprises a guide vane (401) arranged on the bottom ring (101), a bearing assembly (402) arranged on the bottom ring (101), and a top ring assembly (403) arranged at one end of the guide vane (401).

7. The end surface of the guide vane (401) made of a new material according to claim 6 is characterized by: The bearing assembly (402) includes a support plate (402a) arranged on the bottom ring (101), a positioning ring (402b) arranged on the support plate, a positioning sleeve (402c) arranged on the positioning ring (402b), and a bearing (402d) arranged on the positioning sleeve (402c).

8. The end surface of the guide vane (401) made of a new material according to claim 7 is characterized by: The bearing 1 (402d) is movably connected to a positioning column 1 (404), and one end of the positioning column 1 (404) is arranged on the guide vane (401).

9. The end surface of the guide vane (401) made of a new material according to claim 8 is characterized in that: The top ring assembly (403) includes a top cover (403a) arranged on the guide vane (401), a second support plate (403b) arranged on the top cover (403a), a second positioning ring (403c) arranged on the second support plate (403b), a second positioning sleeve (403d) arranged on the second positioning ring (403c), and a second bearing (403e) arranged on the second positioning sleeve (403d).

10. The end surface of the guide vane (401) made of a new material according to claim 9 is characterized in that: The second bearing (403e) is movably connected with a second positioning column (405), and one end of the second positioning column (405) is arranged on the guide vane (401).

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