Buttress for improving flow state of water inlet forebay of through-flow hydropower station

Abstract

The utility model discloses a buttress for improving the flow state of a water inlet forebay of a tubular hydropower station, which relates to the field of hydraulic engineering and comprises a water inlet forebay, a bulb tubular turbine and a 1 / 4 arc buttress. The bulb tubular turbine is detachably connected to the outer side of the bottom of the water inlet forebay; according to the buttress for improving the flow state of the water inlet forebay of the tubular hydropower station, the flow state of fluid at an inlet of a unit is improved, the overall operation efficiency of the unit is improved, and the service life of the water inlet forebay is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy projects, in particular to a pier for improving the flow pattern of the forebay of a bulb tubular hydropower station. Background Technique

[0002] In the design and operation of bulb tubular hydropower stations, the flow pattern of the forebay has an extremely important impact on the power generation efficiency and operation stability of the entire power station. The sediment retaining dam plays an important role in soil and water conservation projects and river management. By slowing down the water flow velocity, increasing the water flow path length, and using gravity to separate sediment and water, it effectively reduces the erosion of sediment on downstream river channels and farmland. The reasonable design and application of the sediment retaining dam not only contribute to disaster prevention and reduction, but also promote the sustainable utilization and management of water resources. As an important structure for controlling sediment entering the water turbine, the rationality of its design is directly related to the quality of the water flow.

[0003] When the water flow passes through the sediment retaining dam, due to the unreasonable flow velocity, flow direction, and dam body design, vortices are likely to form behind the dam. These vortices not only reduce the kinetic energy of the water flow, but may also cause air flow disorder, further affecting the subsequent flow pattern. The existence of vortices will directly affect the efficiency of the water turbine because the vortices cause the water flow to lose some energy before entering the unit, and the flow state becomes unstable. This will lead to a decrease in the operating efficiency of the water turbine, and in severe cases, it may also cause the unit to vibrate. Vortices will also affect the overall flow pattern of the forebay, resulting in uneven water flow distribution and affecting the stability of the water level in the pool. The fluctuation of the water level will be feedback to the operation of the water turbine, causing a further decrease in efficiency.

[0004] From the perspective of the flow pattern problem of the forebay, before the water flow enters the bulb tubular water turbine, due to reasons such as water flow disorder and uneven distribution, the efficiency of the water turbine will be reduced, and even the stable operation of the entire unit will be affected. Therefore, setting reasonable guide piers or piers in the forebay can effectively adjust the water flow direction and velocity, reduce vortices and backflow phenomena, and make the water flow enter the water turbine more evenly. This not only improves the operating efficiency of the water turbine, but also reduces the wear of the equipment and extends the service life of the power station.

[0005] Therefore, a pier for improving the flow pattern of the forebay of a bulb tubular hydropower station is needed to improve the hydraulic efficiency and stability of the hydropower station. Content of the Utility Model

[0006] The purpose of the utility model is to provide a pier for improving the flow pattern of the forebay of a bulb tubular hydropower station, which can effectively improve the dynamic characteristics of the water flow and thus achieve the purpose of improving the hydraulic efficiency of the hydropower station.

[0007] A pier for improving the flow pattern of the forebay of a bulb tubular hydropower station provided by the utility model includes a forebay, a bulb tubular water turbine, and a 1 / 4 circular pier;

[0008] The bulb tubular turbine is detachably connected to the outer side of the bottom of the forebay.

[0009] The 1 / 4 circular arc pier is fixedly connected to the top of the electromagnetic fixing device.

[0010] Preferably, two inlet channels are arranged on one side of the bottom of the forebay, and the inlet channels are arranged side by side.

[0011] Preferably, one end of the inlet channel is arranged inside the forebay, and the other end is detachably connected to the bulb tubular turbine.

[0012] Preferably, a sand trap is arranged inside the forebay near the inlet channel. The 1 / 4 circular arc pier is arranged on the side of the inlet channel far from the edge of the forebay, and a right wall is arranged on the other side of the circular arc pier.

[0013] Preferably, the distance between the center position of the 1 / 4 circular arc pier and the wall surface of the right wall is 0.25 - 0.75 times the width of the inlet channel.

[0014] Preferably, the circular arc radius of the 1 / 4 circular arc pier is 0.75 - 1.25 times the width of the inlet flow channel.

[0015] Preferably, the circular arc thickness of the 1 / 4 circular arc pier is 0.5 - 1.0 times the bottom thickness of the sand trap.

[0016] Preferably, the 1 / 4 circular arc pier is cast with cement and its surface is provided with abrasion-resistant material protection.

[0017] Therefore, the present utility model adopts the above-mentioned pier for improving the flow pattern of the forebay of a tubular hydropower station. In the field of water conservancy projects, a pier is arranged in front of the inlet of the sand trap and the bulb tubular turbine unit to improve the fluid flow pattern at the inlet of the unit, enhance the overall operation efficiency of the unit, and extend the service life of the forebay.

[0018] The technical solution of the present utility model will be further described in detail below with reference to the drawings and embodiments. Brief Description of the Drawings

[0019] Figure 1 It is the front view of a pier for improving the flow pattern of the forebay of a tubular hydropower station according to the present utility model.

[0020] Reference Signs:

[0021] 1, Forebay; 12, Inlet Channel; 13, Sand Trap; 2, Bulb Tubular Turbine; 3, 1 / 4 Circular Arc Pier; 4, Right Wall. Detailed Description of the Embodiment

[0022] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those with ordinary skills in the field to which the present utility model belongs.

[0024] The terms such as "including" or "comprising" used in the present utility model mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. The orientation or positional relationship indicated by terms such as "inside", "outside", "above", "below", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In the present utility model, unless otherwise clearly specified and limited, terms such as "attaching" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] As shown in the attached Figure 1 drawings, the present utility model discloses a pier for improving the flow pattern of the forebay of a tubular hydropower station, including a forebay, a bulb tubular turbine, and a 1 / 4 circular pier;

[0026] The bulb tubular turbine is detachably connected to the outer side of the bottom of the forebay;

[0027] The 1 / 4 circular pier is fixedly connected to the top of the electromagnetic fixing device.

[0028] Further, two inlet channels are arranged on one side of the bottom of the forebay, and the inlet channels are arranged side by side. The water flow direction is from the forebay to the inlet channels;

[0029] Further, one end of the inlet channel is arranged inside the forebay, and the other end is detachably connected to the bulb tubular turbine. The bulb tubular turbine is used to transport water, and the water flows from the inlet channel to the bulb tubular turbine.

[0030] Since a large number of vortices are generated when the water flow passes through the sediment interception weir and enters the two bulb tubular turbines, which affects the flow state of the water after entering the bulb tubular turbine and the operation efficiency of the unit, piers are arranged between the sediment interception weir and the inlet of the unit to improve the fluid flow state at the inlet of the unit, enhance the overall operation efficiency of the unit, and extend the service life of the forebay.

[0031] Furthermore, a sediment interception weir is arranged inside the forebay near the inlet channel. The 1 / 4 circular arc pier is arranged on the side of the inlet channel far from the edge of the forebay, and a right wall is arranged on the other side of the circular arc pier.

[0032] Furthermore, the distance between the center position of the 1 / 4 circular arc pier and the wall surface of the right wall is 0.25 - 0.75 times the width of the inlet channel.

[0033] Furthermore, the circular arc radius of the 1 / 4 circular arc pier is 0.75 - 1.25 times the width of the water inlet channel.

[0034] Furthermore, the circular arc thickness of the 1 / 4 circular arc pier is 0.5 - 1.0 times the bottom thickness of the sediment interception weir.

[0035] That is, assuming the width of the inlet channel is L, the bottom width of the sediment interception weir is d, and the distance between the center position of the 1 / 4 circular arc pier and the right side wall surface is X.

[0036] The thickness of the circular arc pier is 0.5 - 1.0 times the bottom thickness (d) of the sediment interception weir, the circular arc radius is 0.75 - 1.25 times the width (L) of the water inlet channel, and the distance between the center position of the 1 / 4 circular arc pier and the right side wall surface is X = 0.25 - 0.75L.

[0037] The data mentioned in this new type are obtained from the applicant's experience. This data can improve the fluid flow state at the inlet of the bulb tubular turbine, enhance the overall operation efficiency of the unit, and extend the service life of the forebay.

[0038] Furthermore, the 1 / 4 circular arc pier is cast with cement, and the surface is provided with abrasion-resistant material protection.

[0039] Cement casting has good stability, durability, economy, adaptability, etc. The abrasion-resistant material can extend the service life, reduce the maintenance cost, protect the water quality, and meet the specification requirements.

[0040] The piers cast with concrete have high compressive strength and can withstand the heavy pressure from pipelines and media. After the concrete hardens, its volume is stable and will not undergo significant deformation due to changes in temperature or humidity, ensuring the long-term stability of the piers. The reinforced concrete structure has good seismic performance and can maintain the structural integrity even in areas with frequent geological activities. The concrete piers are designed to effectively resist various external adverse factors such as weathering and water flow impact.

[0041] The anti-abrasion material can effectively slow down the abrasion of the water flow, sediment, etc. on the surface of the pier and extend its service life. By protecting the surface of the pier, the invasion of external factors on the internal structure of the concrete can be reduced. The use of the anti-abrasion material reduces the number of repairs and replacements caused by abrasion and lowers the long-term maintenance cost. In harsh environments, such as high-speed water flow or water bodies containing corrosive substances, the role of the anti-abrasion material is particularly important.

[0042] The anti-abrasion materials for piers include self-floating FRP composite flexible anti-collision caissons, steel-UHPFRC combined anti-collision devices, anti-collision floating caisson structures connected by multi-segment dovetail joints, etc.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A pier for improving the flow pattern of the forebay of a tubular hydropower station, characterized in that, It includes an intake forebay, a bulb tubular turbine, and a 1 / 4 circular arc pier; The bulb tubular turbine is detachably connected to the outer side of the bottom of the intake forebay; The 1 / 4 circular arc pier is fixedly connected to the top of the electromagnetic fixing device.

2. The buttress for improving the flow pattern of the forebay of a tubular hydropower station according to claim 1, characterized in that, Two inlet channels are arranged on one side of the bottom of the intake forebay, and the inlet channels are arranged side by side.

3. The buttress for improving the flow pattern of the forebay of a tubular hydropower station according to claim 2, characterized in that, One end of the inlet channel is arranged inside the intake forebay, and the other end is detachably connected to the bulb tubular turbine.

4. A pier for improving the flow pattern of the forebay of a tubular hydropower station according to claim 3, characterized in that, A sand trap dam is arranged inside the intake forebay near the inlet channel. The 1 / 4 circular arc pier is arranged on the side away from the edge of the intake forebay of the inlet channel, and a right wall is arranged on the other side of the circular arc pier.

5. A pier for improving the flow pattern of the forebay of a tubular hydropower station according to claim 4, characterized in that, The distance between the center position of the 1 / 4 circular arc pier and the wall surface of the right wall is 0.25 - 0.75 times the width of the inlet channel.

6. The pier for improving the flow pattern of the forebay of a tubular hydropower station according to claim 4, characterized in that, The circular arc radius of the 1 / 4 circular arc pier is 0.75 - 1.25 times the width of the water inlet channel.

7. A pier for improving the flow pattern of the forebay of a tubular hydropower station according to claim 4, characterized in that, The circular arc thickness of the 1 / 4 circular arc pier is 0.5 - 1.0 times the bottom thickness of the sand trap dam.

8. A pier for improving the flow pattern of the forebay of a tubular hydropower station according to claim 1, characterized in that, The 1 / 4 circular arc pier is made of cast cement and is provided with anti-abrasion material protection on the surface.

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