Hydropower station guide vane end face groove sealing device and method

Abstract

The invention discloses a hydropower station guide vane end face groove sealing device and method, and relates to the technical field of guide vane groove sealing, the hydropower station guide vane end face groove sealing device comprises a groove formed in the guide vane end face; the sealing strip is arranged in the groove; the top width of the groove is smaller than the bottom width of the groove, the groove is consistent with the shape of the cross section of the sealing strip, and a cavity is formed in the sealing strip; the cuttable sealing strip made of the flexible material is arranged, the blocking pieces are pasted to the two ends of the cuttable sealing strip, then the sealing strip is installed in the dovetail-shaped groove, the filling agent is injected into the material injection hole through the injection device, after the filling agent is cured, the sealing strip is tightly attached to the groove, the sealing strip is effectively prevented from falling off, meanwhile, a flexible seal is formed in the groove, and the effect of sealing the end face of the guide vane is achieved; the guide vane does not need to be dismantled, the installation process is greatly simplified, the maintenance cost and time are reduced, and meanwhile good sealing performance is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of guide vane groove sealing, and in particular to a guide vane end face groove sealing device and method for a hydropower station. BACKGROUND

[0002] As an important clean energy facility, one of the core devices of a hydropower station is a water turbine. The guide vane of the water turbine plays a key role in regulating the direction and flow of water during operation. The guide vane end face sealing is located between the top cover, the bottom ring and the guide vane, and is mainly used to achieve end face water stopping when the guide vane is closed. Good sealing performance not only effectively prevents water leakage, but also improves the operation efficiency of the unit and prolongs the service life of the equipment.

[0003] The conventional guide vane end face sealing structure usually adopts a dovetail-shaped groove design, which is installed in cooperation with a triangular sealing strip. Due to the geometric characteristics of the dovetail-shaped groove (the top width is smaller than the bottom width), the sealing strip can only be installed into the groove from the side. However, in order to replace the damaged sealing strip, the existing installation method must first remove the guide vane and its related components, resulting in a complex maintenance process and a long time-consuming. In addition, the removal of the guide vane requires a shutdown operation, which further increases the operating cost and downtime of the hydropower station, adversely affecting the power generation efficiency.

[0004] Based on the above problems, we propose a guide vane end face groove sealing device and method for a hydropower station. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is how to achieve convenient installation and replacement of the guide vane end face dovetail-shaped groove sealing without removing the guide vane, so as to reduce the maintenance cost and time, avoid long-term shutdown of the hydropower station, and improve the operation efficiency of the equipment.

[0006] The above technical problem is solved by the following technical solution: the present application proposes a guide vane end face groove sealing device for a hydropower station, which comprises a groove opened in the end face of the guide vane; a sealing strip arranged inside the groove; the top width of the groove is smaller than the bottom width, the cross-sectional shape of the groove is consistent with that of the sealing strip, and a cavity is opened in the inside of the sealing strip.

[0007] In one preferred embodiment of the guide vane end face groove sealing device for a hydropower station described in the present application: the sealing strip comprises a top surface and a bottom surface, and a first side surface and a second side surface are arranged between the top surface and the bottom surface.

[0008] In one preferred embodiment of the guide vane end face groove sealing device for a hydropower station described in the present application: the cross-sectional path of the first side surface to the second side surface gradually increases from the top surface to the bottom surface.

[0009] In a preferred embodiment of the guide vane end face groove sealing device for a hydropower station according to the present invention, plugging pieces are provided at both ends of the seal strip, and the shape of the plugging pieces is consistent with the cross-sectional shape of the seal strip.

[0010] In a preferred embodiment of the guide vane end face groove sealing device for a hydropower station according to the present invention, a material injection hole and an exhaust hole are provided on the outer wall of the top surface.

[0011] In a preferred embodiment of the sealing device for the guide vane end face groove of a hydropower station according to the present invention, both the injection hole and the exhaust hole are connected to the cavity.

[0012] In a preferred embodiment of the sealing device for the guide vane end face groove of a hydropower station according to the present invention, the length of the sealing strip matches the length of the groove.

[0013] In a preferred embodiment of the sealing device for the guide vane end face groove of a hydropower station according to the present invention: the sealing strip is fixed by injecting a filler through an injection hole, and the filler is a polymer material with controllable curing time.

[0014] In a preferred embodiment of the guide vane end face groove sealing device for a hydropower station according to the present invention, both the sealing strip and the blocking piece are made of flexible materials.

[0015] The present invention also proposes a method for sealing the groove on the end face of the guide vane of a hydropower station, which includes cutting a seal according to the length of the groove; pasting plugs on both ends of the seal; installing the seal into the groove; injecting a filler into the cavity through an injection hole, and stopping the injection after the filler overflows from the exhaust hole; and allowing the filler to solidify before sealing the groove.

[0016] The beneficial effects of the present invention are as follows: by providing a cuttable seal made of flexible material, pasting plugs at both ends, and then installing the seal into the dovetail groove, using an injection device to inject filler into the injection hole, after the filler solidifies, the seal fits tightly into the groove, effectively preventing the seal from falling off, and at the same time forming a flexible seal inside the groove to achieve the effect of sealing the guide vane end face without removing the guide vane, greatly simplifying the installation process, reducing maintenance costs and time, and ensuring good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0018] Figure 1 Shows a schematic diagram of the overall structure of the sealing device;

[0019] Figure 2 shows a schematic diagram of the groove structure;

[0020] Figure 3 A schematic diagram of a seal is shown;

[0021] Figure 4 Shows a schematic diagram of the seal connection structure;

[0022] Figure 5 Shows a schematic diagram of the connection structure between the seal and the blocking piece;

[0023] Figure 6 A schematic diagram of the injection hole and exhaust hole structure is shown. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0025] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0026] Reference Figures 1 to 6 This embodiment provides a sealing device for a groove on the end face of a guide vane of a hydropower station, comprising a groove 1 formed on the end face of a guide vane D; the cross-section of the groove 1 is dovetail-shaped, with the top width being smaller than the bottom width to ensure that a seal can be firmly embedded in the groove 1 and not easily fall off; a seal 2 is provided inside the groove 1; the seal 2 is provided inside the groove 1 to achieve a sealing function on the end face of the guide vane, the cross-sectional shape of the groove 1 is consistent with that of the seal 2, and a cavity 3 is provided inside the seal 2 for injecting a filler.

[0027] As an optional embodiment, Figure 4 As shown, the seal 2 includes a top surface 21 and a bottom surface 22. The width of the top surface 21 is smaller than that of the bottom surface 22, and the bottom surface 22 is in contact with the bottom of the groove 1. A first side surface 23 and a second side surface 24 are provided between the top surface 21 and the bottom surface 22. The first side surface 23 and the second side surface 24 are respectively in contact with the two side walls of the groove 1.

[0028] As an optional embodiment, Figure 4 As shown, the cross-sectional path from the first side surface 23 to the second side surface 24 gradually increases from the top surface 21 to the bottom surface 22 , and the first side surface 23 and the second side surface 24 are preferably designed as inclined surfaces.

[0029] As an optional embodiment, Figure 5As shown, plugging pieces 4 are provided at both ends of the seal 2. The shape of the plugging pieces 4 is consistent with the cross-sectional shape of the seal 2, ensuring that the plugging pieces 4 can fit tightly against the ends of the seal 2 to prevent the filler from leaking from the internal cavity 3 of the seal 2; the plugging pieces 4 are used to seal both ends of the seal 2, thereby forming a complete sealing structure. During installation, the plugging pieces 4 are fixed to the two ends of the seal 2 by gluing or other fixing methods to ensure that the filler will not overflow or flow away after injection.

[0030] As an optional embodiment, Figure 6 As shown, an injection hole 211 and an exhaust hole 212 are provided on the outer wall of the top surface 21. The injection hole 211 is provided on the outer wall of the top surface 21 of the seal 2 and is used to inject filler into the internal cavity 3 of the seal. The exhaust hole 212 is also provided on the outer wall of the top surface 21 of the seal 2. The injection hole 211 and the exhaust hole 212 are respectively close to the plugs at both ends.

[0031] As an optional embodiment, the injection hole 211 and the exhaust hole 212 are both connected to the cavity 3. The through-hole design ensures that the filler can be smoothly injected into the cavity 3 through the injection hole 211 and evenly distributed to the entire internal space of the seal 2; the exhaust hole 212 can discharge the air and excess filler in the cavity 3 to avoid residual bubbles or incomplete filling, thereby ensuring the sealing performance.

[0032] As an optional embodiment, the length of the seal 2 matches the length of the groove 1 to ensure that the seal 2 can completely cover the groove 1, thereby achieving the effect of end face sealing. The seal 2 is made of flexible material and is cuttable. During the actual installation process, the seal 2 can be cut according to the actual length of the groove 1 to ensure that the length of the seal 2 is completely consistent with that of the groove 1.

[0033] As an optional embodiment, the seal 2 is fixed by injecting a filler through the injection hole 211. The filler is a polymer material with controllable curing time, and the filler is preferably an epoxy resin aluminum filler.

[0034] As an optional embodiment, the seal 2 and the plug 4 are both made of flexible materials, preferably nitrile rubber, which can ensure that the seal 2 can be placed in the groove 1 without removing the guide vane. The seal 2 and the plug (4) are made of the same material, which can ensure compatibility and consistency between the two.

[0035] In use, according to actual needs, the sealing strip 2 is cut to a proper length, and the blocking piece 4 is pasted on both ends of the sealing strip 2 by using instant dry glue or other industrial strong glue. The pasted sealing strip 2 is installed into the groove 1 of the guide vane end face, so as to ensure that the outer wall of the sealing strip 2 is tightly fitted with the inner wall of the groove 1. Then, the injection hole 211 and the exhaust hole 212 are respectively drilled on both sides of the sealing strip. The filling agent (preferably a high polymer material with controllable curing time, such as an epoxy resin aluminum filling agent) is injected through the injection hole 211 until the filling agent overflows from the exhaust hole 212. After 24 hours of standing, the residual filling agent and the surface of the sealing strip 2 are trimmed after the filling agent is completely cured, so as to complete the installation. The sealing strip can be replaced without dismounting the guide vane, which greatly reduces the maintenance cost and time, and ensures good sealing performance.

[0036] Reference Figures 1 to 6 The embodiment provides a guide vane end face groove sealing device of a hydropower station, which comprises the following steps: cutting a sealing strip according to the length of a groove; pasting blocking pieces on both ends of the sealing strip; installing the sealing strip into the groove; injecting a filling agent into a cavity through an injection hole, and stopping the injection of the filling agent after the filling agent overflows from an exhaust hole; and sealing the groove after the filling agent is cured.

[0037] Finally, it should be noted that the above detailed description of the method and device is only an embodiment, and those skilled in the art can modify the embodiment in different ways without departing from the scope of the present application.

Claims

1. A sealing device for the end face groove of a guide vane of a hydropower station, characterized by: include, A groove (1) is provided on the end surface of the guide vane (D); A seal (2) provided inside the groove (1); The top width of the groove (1) is smaller than the bottom width, the groove (1) and the cross-sectional shape of the seal (2) are consistent, and a cavity (3) is provided inside the seal (2).

2. The sealing device for the guide vane end face groove of a hydropower station according to claim 1, characterized in that: The seal (2) comprises a top surface (21) and a bottom surface (22), and a first side surface (23) and a second side surface (24) are provided between the top surface (21) and the bottom surface (22).

3. The sealing device for the guide vane end face groove of a hydropower station according to claim 2, characterized in that: The cross-sectional path from the first side surface (23) to the second side surface (24) gradually increases from the top surface (21) to the bottom surface (22).

4. The sealing device for the guide vane end face groove of a hydropower station according to claim 3, characterized in that: Blocking pieces (4) are provided at both ends of the seal (2); the shape of the blocking pieces (4) is consistent with the cross-sectional shape of the seal (2).

5. The sealing device for the guide vane end face groove of a hydropower station according to claim 2 or 3, characterized in that: The outer wall of the top surface (21) is provided with a material injection hole (211) and an exhaust hole (212).

6. The sealing device for the guide vane end face groove of a hydropower station according to claim 5, characterized in that: The injection hole (211) and the exhaust hole (212) are both connected to the cavity (3).

7. The sealing device for the guide vane end face groove of a hydropower station according to claim 1, characterized in that: The length of the seal (2) matches the length of the groove (1).

8. The sealing device for the guide vane end face groove of a hydropower station according to claim 2, characterized in that: The seal (2) is fixed by injecting a filler through an injection hole (211), wherein the filler is a polymer material with controllable curing time.

9. The sealing device for the guide vane end face groove of a hydropower station according to claim 4, characterized in that: The sealing strip (2) and the blocking piece (4) are both made of flexible materials.

10. A method for sealing the end face groove of a guide vane of a hydropower station, characterized by: The device comprises a guide vane end face groove sealing device for a hydropower station as claimed in any one of claims 1 to 9, further comprising: Cut the seal according to the groove length; Paste plugs on both ends of the seal; Install the seal into the groove; Inject the filler into the cavity through the injection hole, and stop injecting when the filler overflows from the exhaust hole; After the filler is cured, the groove can be sealed.

Images