Fixed guide vane, water guide mechanism and pump turbine

Abstract

The utility model provides a fixed guide vane, a water guide mechanism and a pump turbine, the fixed guide vane is applied to the pump turbine, the pump turbine is provided with a volute, the volute is provided with a center line, and the fixed guide vane is characterized by comprising a far shaft section, a far shaft section and a far shaft section, and the near-shaft section is arranged close to the center line and fixedly connected with the far-shaft section, and the near-shaft section is of a wear-resistant reinforced structure. According to the fixed guide vane, the near-shaft section of the fixed guide vane is arranged to be of the wear-resistant reinforced structure, so that the cavitation resistance, wear resistance and corrosion resistance of the fixed guide vane can be improved, the occurrence of cavitation damage to the near-shaft section of the fixed guide vane is delayed and prevented, and meanwhile, the original hydraulic performance of the fixed guide vane is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hydroelectric machinery, in particular to a fixed guide vane, a water guide mechanism and a water pump turbine. Background Art

[0002] In pumped storage power plant units, the fixed guide vanes on the seat ring of the pump turbine mainly play the role of distributing water flow, so that the high-speed water flow from the volute (power generation condition) or to the volute (pump condition) passes smoothly according to a certain rule. The high-pressure side of the fixed guide vane is the water inlet side of the turbine condition, and the low-pressure side is the water inlet side of the pump condition.

[0003] In order to meet the requirements of bidirectional flow of pump-turbine under turbine and pump working conditions, and to meet the requirements of stiffness and strength of seat ring, the low-pressure side of fixed guide vane adopts thicker wing-shaped design structure as the high-pressure side, which is not conducive to the smooth flow of high-speed water flow. In some operations that deviate from the design working conditions, it is easy to cause local flow separation and thus cause local cavitation. In addition, the fixed guide vane is in the flow channel and needs to withstand repeated impacts of high-speed water flow. Due to the closed nature of the water source of the pumped storage power station, once foreign matter (metal or silt, stone, etc.) enters the water channel, the foreign matter will repeatedly impact the fixed guide vane with the bidirectional water flow of power generation and pump working conditions, causing impact damage pits on the fixed guide vane, affecting the surface flow state, thereby accelerating the damage of cavitation. Furthermore, the water source of some pumped storage power stations contains acidic and alkaline substances, which are easy to produce corrosion pits on the surface of the fixed guide vane material, which will also affect the surface flow state, thereby accelerating the cavitation damage of the fixed guide vane.

[0004] The existing fixed guide vanes have poor performance in resisting cavitation, corrosion and impact wear. Utility Model Content

[0005] The embodiments of the utility model provide a fixed guide vane, a water guide mechanism and a water pump turbine, which can improve the technical problem that the existing fixed guide vane has poor performance in resisting cavitation, corrosion and impact wear.

[0006] In a first aspect, an embodiment of the utility model provides a fixed guide vane, which is applied to a water pump turbine, wherein the water pump turbine has a volute, and the volute has a center line, including:

[0007] a distal section, disposed away from the center line;

[0008] The proximal shaft section is arranged close to the center line and fixedly connected to the distal shaft section. The proximal shaft section is a wear-resistant enhanced structure.

[0009] In an embodiment of the utility model, by setting the proximal section of the fixed guide vane (i.e., the low-pressure side) as a wear-resistant enhanced structure, its anti-cavitation, anti-wear, and anti-corrosion properties can be improved, thereby delaying and preventing the occurrence of cavitation damage in the proximal section of the fixed guide vane, while ensuring the original hydraulic performance of the fixed guide vane.

[0010] In one embodiment, the outer surface of the wear-resistant enhancement structure transitions smoothly with the outer surface of the distal shaft segment.

[0011] In the embodiment of the utility model, by making the outer surface of the wear-resistant enhancement structure and the outer surface of the distal shaft section transition smoothly, the fixed guide vane can be conveniently provided to realize the water guiding function.

[0012] In one embodiment, the length of the wear-resistant reinforcement structure is 10% to 20% of the length of the fixed guide vane.

[0013] In the embodiment of the present utility model, by controlling the proportion of the length of the wear-resistant reinforcement structure in the fixed guide vane, the fixed guide vane can have a good water-guiding function while ensuring its structural strength.

[0014] In one embodiment, the distal shaft section has a first connecting surface, the wear-resistant reinforcement structure has a second connecting surface, and the first connecting surface is bonded to the second connecting surface so that the wear-resistant reinforcement structure is fixedly connected to the distal shaft section.

[0015] In an embodiment of the utility model, the wear-resistant reinforcement structure can be made of non-metallic wear-resistant material, so that the wear-resistant reinforcement structure and the distal shaft section can be fixedly connected by bonding. The non-metallic wear-resistant material has excellent anti-cavitation, anti-wear and anti-corrosion properties, and can effectively delay and prevent the occurrence of cavitation damage of the fixed guide vanes.

[0016] In one embodiment, the distal shaft section has a first connecting surface, the wear-resistant reinforcement structure has a second connecting surface, and the first connecting surface and the second connecting surface are welded to fix the wear-resistant reinforcement structure to the distal shaft section.

[0017] In an embodiment of the utility model, the wear-resistant reinforcement structure can be made of metal wear-resistant material, and the wear-resistant reinforcement structure and the distal shaft section can be fixedly connected by welding, which can facilitate a more stable connection between the two and ensure the overall rigidity of the fixed guide vane.

[0018] In one embodiment, the wear-resistant reinforcement structure has a first plug-in portion, and the distal shaft section is provided with a second plug-in portion, and the first plug-in portion is plug-in-connected with the second plug-in portion and locked by a locking member.

[0019] In the embodiment of the utility model, the wear-resistant reinforcement structure can be made of metal wear-resistant material, and the wear-resistant reinforcement structure and the distal shaft section can be fixedly connected by plug-in, which can also facilitate the replacement of the wear-resistant reinforcement structure.

[0020] In one embodiment, one of the first plug-in portion and the second plug-in portion is a protrusion, and the other is a groove; the protrusion is provided with a first locking hole, and the groove wall of the groove is provided with a second locking hole aligned with the first locking hole, and the locking piece is passed through and locked in the first locking hole and the second locking hole to fix the wear-resistant reinforcement structure to the distal shaft section.

[0021] In an embodiment of the utility model, by inserting the protrusion into the groove and passing the locking piece through the first locking hole and the second locking hole, the wear-resistant reinforcement structure can be fixedly connected to the distal shaft section, while ensuring the water guiding function of the fixed guide vane.

[0022] In one embodiment, the wear-resistant reinforcement structure further has a wear-resistant reinforcement part, which includes a core body and a wear-resistant layer. The core body has a contact surface and a peripheral surface. The first plug-in part is arranged on the contact surface, and the wear-resistant layer covers the peripheral surface.

[0023] In the embodiment of the utility model, the core body can realize the fixed connection between the wear-resistant reinforcement structure and the distal shaft section, and the wear-resistant layer can enhance the anti-cavitation, anti-wear and anti-corrosion performance of the wear-resistant reinforcement structure.

[0024] In one embodiment, the locking member is a bolt; and / or

[0025] The thickness of the wear-resistant layer is 5mm-20mm.

[0026] In the embodiment of the utility model, the protrusion and the groove are fixedly connected by bolts, and the connection method is simple and stable. By controlling the thickness of the wear-resistant layer, the wear-resistant reinforcement structure can have good anti-cavitation, anti-wear and anti-corrosion properties, and can be stably connected to the distal shaft section.

[0027] In a second aspect, an embodiment of the utility model provides a water guiding mechanism, comprising:

[0028] A volute, the inner side of which is open and has a first end and a second end opposite to each other formed on the inner side of the volute;

[0029] The fixed guide vane is arranged between the first end and the second end.

[0030] In a third aspect, an embodiment of the utility model provides a water pump turbine, comprising the above-mentioned water guiding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figures 1 to 3 is a cross-sectional view of a fixed guide vane provided by an embodiment of the utility model;

[0033] Figure 4 It is a structural schematic diagram of a water guiding mechanism provided in an embodiment of the utility model.

[0034] Description of the drawings: fixed guide vane-1; distal shaft section-11; wear-resistant reinforcement structure-12; core-121; wear-resistant layer-122; protrusion-13; bolt-14; second locking hole-15; volute-2; first end-21; second end-22. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] See also Figures 1 to 4 In a first aspect, an embodiment of the utility model provides a fixed guide vane 1, which is applied to a water pump turbine, wherein the water pump turbine has a volute 2, and the volute 2 has a center line, including:

[0037] The distal shaft section 11 is arranged away from the center line;

[0038] The proximal shaft section is arranged close to the center line and fixedly connected to the distal shaft section 11 . The proximal shaft section is a wear-resistant reinforcement structure 12 .

[0039] It can be understood that the volute 2 is a spiral structure, and the center line of the volute 2 is the center line of the spiral structure, that is, the spiral structure rotates around its center line. The shape and size of the fixed guide vane 1 can be set as needed. The material of the distal shaft section 11 can be carbon steel, and the material of the wear-resistant reinforcement structure 12 can be non-metallic wear-resistant material, metal wear-resistant material, or a combination of the two.

[0040] In one embodiment, the outer surface of the wear-resistant enhancement structure 12 transitions smoothly with the outer surface of the distal shaft segment 11 .

[0041] In one embodiment, the length of the wear-resistant reinforcement structure 12 is 10% to 20% of the length of the fixed guide vane 1 .

[0042] See also Figure 2 In one embodiment, the distal shaft segment 11 has a first connecting surface, and the wear-resistant reinforcement structure 12 has a second connecting surface. The first connecting surface is bonded to the second connecting surface so that the wear-resistant reinforcement structure 12 is fixedly connected to the distal shaft segment 11.

[0043] It is understood that the material of the distal shaft section 11 can be carbon steel, and the material of the wear-resistant reinforcement structure 12 can be non-metallic wear-resistant material, and the two can be connected by bonding. Non-metallic wear-resistant material has good wear resistance, corrosion resistance and better cavitation resistance.

[0044] See also Figure 1 In one embodiment, the distal shaft segment 11 has a first connecting surface, and the wear-resistant reinforcement structure 12 has a second connecting surface. The first connecting surface and the second connecting surface are welded to fix the wear-resistant reinforcement structure 12 to the distal shaft segment 11.

[0045] It can be understood that the material of the distal shaft section 11 can be carbon steel, and the material of the wear-resistant reinforcement structure 12 can be a metal wear-resistant material, such as stainless steel (stainless steel has good wear and corrosion resistance, and its strength is equivalent to or even higher than that of carbon steel), and the two can be connected by welding.

[0046] See also Figure 3 In one embodiment, the wear-resistant reinforcement structure 12 has a first plug-in portion, and the distal shaft section 11 is provided with a second plug-in portion, and the first plug-in portion is plug-in-connected with the second plug-in portion and locked by a locking member.

[0047] It can be understood that the material of the distal shaft section 11 can be carbon steel, and the material of the wear-resistant reinforcement structure 12 can be metal wear-resistant material or metal material composite non-metal material, and the two can be connected by plugging.

[0048] See also Figure 3In one embodiment, one of the first plug-in portion and the second plug-in portion is a protrusion 13, and the other is a groove; a first locking hole is provided on the protrusion 13, and a second locking hole 15 aligned with the first locking hole is provided on the groove wall of the groove, and the locking piece is passed through and locked in the first locking hole and the second locking hole 15 to fix the wear-resistant reinforcement structure 12 to the distal shaft section 11.

[0049] It is understood that the shape and size of the protrusion 13 can be set as needed, and the shape and size of the groove can be set according to the protrusion 13. The size and position of the first locking hole and the second locking hole 15 can be set as needed. The locking of the locking member can be achieved by providing bolts on both sides of the locking member, and the bolts are provided in the second locking hole 15.

[0050] See also Figure 3 In one embodiment, the wear-resistant reinforcement structure 12 also has a wear-resistant reinforcement part, and the wear-resistant reinforcement part includes a core 121 and a wear-resistant layer 122. The core 121 has a contact surface and a peripheral surface. The first plug-in part is arranged on the contact surface, and the wear-resistant layer 122 covers the peripheral surface.

[0051] It can be understood that the material of the core 121 can be metal, such as steel, and the material of the wear-resistant layer 122 can be non-metallic wear-resistant material. The core 121 of the metal material can provide sufficient strength for the fixed guide vane, and the wear-resistant layer 122 of the non-metallic wear-resistant material can provide good cavitation resistance for the fixed guide vane.

[0052] See also Figure 3 In one embodiment, the locking member is a bolt 14; and / or

[0053] The wear-resistant layer 122 has a thickness of 5 mm to 20 mm.

[0054] It can be understood that the locking member is a bolt 14 , and the bolt 14 is inserted into the first locking hole and the second locking hole 15 .

[0055] See also Figure 4 In a second aspect, an embodiment of the utility model provides a water guiding mechanism, comprising:

[0056] A volute 2, the inner side of the volute 2 is open, and a first end 21 and a second end 22 opposite to each other are formed on the inner side of the volute 2;

[0057] The fixed guide vane is disposed between the first end 21 and the second end 22 .

[0058] In a third aspect, an embodiment of the utility model provides a water pump turbine, comprising the above-mentioned water guiding mechanism.

[0059] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A fixed guide vane, applied to a pump turbine, the pump turbine having a volute, the volute having a center line, characterized in that: include: a distal section, disposed away from the center line; The proximal shaft section is arranged close to the center line and fixedly connected to the distal shaft section. The proximal shaft section is a wear-resistant enhanced structure.

2. The fixed guide vane according to claim 1, characterized in that: The outer surface of the wear-resistant reinforcement structure smoothly transitions with the outer surface of the distal shaft segment; and / or The length of the wear-resistant reinforcement structure is 10% to 20% of the length of the fixed guide vane.

3. The fixed guide vane according to claim 1, characterized in that: The distal shaft section has a first connecting surface, and the wear-resistant reinforcement structure has a second connecting surface. The first connecting surface is bonded to the second connecting surface so that the wear-resistant reinforcement structure is fixedly connected to the distal shaft section.

4. The fixed guide vane according to claim 1, characterized in that: The distal shaft section has a first connecting surface, the wear-resistant reinforcement structure has a second connecting surface, and the first connecting surface is welded to the second connecting surface so that the wear-resistant reinforcement structure is fixedly connected to the distal shaft section.

5. The fixed guide vane according to claim 1, characterized in that: The wear-resistant reinforcement structure has a first plug-in portion, and the distal shaft section is provided with a second plug-in portion, and the first plug-in portion is plug-in-connected with the second plug-in portion and locked by a locking member.

6. The fixed guide vane according to claim 5, characterized in that: One of the first plug-in portion and the second plug-in portion is a protrusion, and the other is a groove; the protrusion is provided with a first locking hole, and the groove wall of the groove is provided with a second locking hole aligned with the first locking hole, and the locking piece is passed through and locked in the first locking hole and the second locking hole to fix the wear-resistant reinforcement structure to the distal shaft section.

7. The fixed guide vane according to claim 5 or 6, characterized in that: The wear-resistant reinforcement structure also has a wear-resistant reinforcement part, which includes a core body and a wear-resistant layer. The core body has an abutment surface and a peripheral surface. The first plug-in part is arranged on the abutment surface, and the wear-resistant layer covers the peripheral surface.

8. The fixed guide vane according to claim 7, characterized in that: The locking member is a bolt; and / or The thickness of the wear-resistant layer is 5mm-20mm.

9. A water guide mechanism, characterized in that: include: A volute, the inner side of which is open and has a first end and a second end opposite to each other formed on the inner side of the volute; The fixed guide vane according to any one of claims 1 to 8 is arranged between the first end and the second end.

10. A water pump turbine, characterized in that: It comprises the water guiding mechanism as claimed in claim 9.

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