Pipeline outlet structure of drainage system of hydropower station
By designing a water power station drainage system pipe exit structure including the overflow structure and drainage well, the problem of unstable operation of the pump operation and the affected by the landscape of the power station has been solved, and the stable operation of the pump and the protection of the power station landscape.
Patent Information
- Application Number
- CN202420133274.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-19
AI Technical Summary
In existing hydropower stations, when the downstream tail water level changes by a large margin, the outlet elevation of the drainage pipeline is low, resulting in a large head change of the pump, which is not conducive to the stable operation of the water pump. At the same time, the long-term tail water level is lower than the outlet elevation of the drainage pipeline. Affects the power station landscape.
Design a type of hydropower drainage system pipeline exit structure, including the overflow structure and drainage well. The exit of the drainage pipe is set at the bottom of the overflow well. The overflow well is connected to the top of the drainage well. Weir, ensure that the tail water does not return to the water collection well, and set the water outlet to improve the drainage effect by tilting the water outlet.
The stable operation of the pump is achieved, reducing the changing range, preventing tail water from pouring, and avoiding the risk of water flooding the plant, while maintaining the landscape of the power station.
Smart Images
Figure CN222412898U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drainage systems of hydropower stations, in particular to a pipeline outlet structure of a drainage system of a hydropower station. Background Art
[0002] In the existing hydropower stations with large fluctuations in the downstream tailwater level, if the drainage pipe outlet elevation is low, the drainage pump operating head fluctuations will be large, which is not conducive to the stable operation of the pump. In order to ensure the stable operation of the downstream tailwater level under large fluctuations, the outlet elevation of the drainage pipe is often set at a higher position, that is, near the elevation of the flood tailwater level, so that the pump can operate stably within a certain range of head fluctuations. However, if the outlet of the drainage pipe is set at a higher position and the tailwater level of the power station is long-term below the outlet elevation of the drainage pipe, the landscape of the power station will be affected. Utility Model Content
[0003] The utility model provides a pipeline outlet structure of a hydropower station drainage system, aiming to maintain the stable operation of a water pump while solving the problem that the tail water level of the power station is below the drainage pipe outlet elevation for a long time, affecting the power station landscape.
[0004] The utility model provides the following technical solutions to achieve the above objectives:
[0005] A pipeline outlet structure of a drainage system of a hydropower station comprises an overflow structure. A drainage well is arranged on one side of the overflow structure. A water outlet is arranged at the bottom of the drainage well. The elevation of the water outlet is less than the full tail water level of one machine.
[0006] Furthermore, the overflow structure includes a drain pipe, the outlet end of the drain pipe is arranged at the bottom of the overflow well, and the overflow well is connected to the top of the drain well and a partition wall is arranged between them.
[0007] Furthermore, the outlet end of the drain pipe is arranged upward.
[0008] Furthermore, the top elevation of the partition wall is greater than or equal to the verified tail water level.
[0009] Furthermore, a circular arc overflow weir is arranged on the top of the partition wall.
[0010] Furthermore, the overflow structure includes a drainage pipe, which is connected to a vertically arranged overflow pipe, and an outlet end of the overflow pipe is arranged at the top of the drainage well.
[0011] Furthermore, the outlet elevation of the overflow pipe is greater than or equal to the verified tail water level.
[0012] Furthermore, the water outlet is arranged at an angle.
[0013] Furthermore, a grille cover is provided at the top of the overflow structure and the drainage well.
[0014] Beneficial Effects
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] 1. After the initial drainage of the utility model, the water level of the water collection well is at the elevation of the partition wall weir top for a long time. During the later drainage, the lift amplitude of the water pump is only affected by the water level amplitude of the overflow structure, so the operation of the water pump is kept stable.
[0017] 2. The top elevation of the partition wall of the utility model is greater than or equal to the calibrated tail water level, which prevents the tail water from entering the collection well through the overflow well, eliminating the risk of flooding the plant due to tail water backflow when the check valve on the drainage pipeline fails.
[0018] 3. The outlet elevation of the overflow well of the utility model is below the tail water level of one unit, and the phenomenon of drainage of the tail water drainage pipe will not be seen, thus maintaining the landscape of the hydropower station. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.
[0020] Figure 1 It is a structural schematic diagram of the utility model;
[0021] Figure 2 This is a schematic structural diagram of another embodiment of the utility model;
[0022] Figure numerals: 1-drain pipe; 2-overflow well; 3-drainage well; 4-water outlet; 5-partition wall; 6-grating cover; 7-overflow pipe. DETAILED DESCRIPTION
[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention.
[0024] It should be noted that in the present invention: the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or apparatuses; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These The terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation; the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "install", "set", "provided with", "connected", "connected", "sleeved", etc. should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. In addition, some terms can be used to express other meanings in addition to indicating orientation or positional relationships. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For ordinary technicians in this field, the specific meanings of these terms in the utility model can be understood according to specific circumstances.
[0025] Example 1. A pipe outlet structure of a hydropower station drainage system, with reference to the structure Figure 1 The arrow direction in the figure is the water flow direction, including an overflow structure, a drainage well 3 is set on one side of the overflow structure, and a water outlet 4 is set at the bottom of the drainage well 3. The elevation of the water outlet 4 is less than the full tail water level of one unit. The setting elevation of the water outlet 4 is less than the full tail water level of one unit. The phenomenon of drainage of the drainage pipe at the tail water will not be seen, which is beneficial to the landscape of the power station.
[0026] The overflow structure comprises a drainage pipe 1 , the outlet end of which is arranged at the bottom of an overflow well 2 , and a partition wall 5 is arranged between the overflow well 2 and the drainage well 3 .
[0027] The outlet end of the drainage pipe 1 is arranged upwards to prevent the discharged tail water from directly impacting the concrete structure in the well and causing erosion of the concrete structure.
[0028] The top elevation of the partition wall 5 is greater than or equal to the verified tail water level to prevent the tail water from flowing back from the overflow well 3 to the water collection well 2 and causing tail water backflow.
[0029] A circular arc overflow weir is arranged on the top of the partition wall 5. The circular arc overflow weir is arranged to facilitate the water in the water collection well 2 to flow into the overflow well 3.
[0030] The tops of the water collecting well 2 and the overflow well 3 are provided with a grille cover plate 6. The grille cover plate 6 is provided to circulate with air for exhaust.
[0031] Working principle and use method of this embodiment: The outlet structure of the drainage system of the hydropower station is used in the drainage system of the hydropower station, specifically in the large-volume concrete structure of the tailwater platform. According to the above structure, the tailwater discharged by the generator set enters the drainage pipe 1, such as Figure 1 As shown, the water flows along the drainage pipe 1 into the overflow well 2, and after the overflow well 2 is filled, it flows into the drainage well 3 and finally is discharged from the outlet 4.
[0032] Example 2. A pipe outlet structure for a hydropower station drainage system. The solution of using the overflow well 2 in Example 1 can reduce the length of the "drainage pipe buried pipe". This example takes into account the convenience of construction of civil engineering and the structure is referenced Figure 2 The overflow structure includes a drain pipe 1 , which is connected to a vertically arranged overflow pipe 7 , and an outlet end of the overflow pipe 7 is arranged at the top of the drainage well 3 .
[0033] The outlet elevation of the overflow pipe 7 is greater than or equal to the check tail water level.
[0034] The water outlet 4 is inclined to improve the drainage effect and prevent silt accumulation.
[0035] Working principle and use method of this embodiment: The outlet structure of the drainage system of the hydropower station is used in the drainage system of the hydropower station, specifically in the large-volume concrete structure of the tailwater platform, and is implemented according to the above structure, such as Figure 2 As shown, the tail water discharged from the generator set enters the drain pipe 1, enters the overflow pipe 7 along the drain pipe 1, flows out from the outlet end of the overflow pipe 7 into the drain well 3, and finally flows out from the outlet 4.
[0036] Obviously, the above is only a part of the embodiments of the utility model, not all of the embodiments. The above embodiments are not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any combination, modification, equivalent replacement, improvement and all other embodiments that can be made by ordinary technicians in the field within the spirit and principle of the utility model should be within the protection scope of the utility model.
Claims
1. A pipeline outlet structure of a hydropower station drainage system, characterized in that: It comprises an overflow structure, a drainage well (3) is arranged on one side of the overflow structure, a water outlet (4) is arranged at the bottom of the drainage well (3), and the elevation of the water outlet (4) is less than the full tail water level of one engine.
2. The pipeline outlet structure of the drainage system of a hydropower station according to claim 1 is characterized in that: The overflow structure comprises a drainage pipe (1), the outlet end of the drainage pipe (1) being arranged at the bottom of an overflow well (2), and the overflow well (2) is connected to the top of a drainage well (3) with a partition wall (5) arranged therebetween.
3. The outlet structure of the drainage system of a hydropower station according to claim 2, characterized in that: The outlet end of the drainage pipe (1) is arranged upward.
4. The outlet structure of the drainage system of a hydropower station according to claim 2, characterized in that: The top elevation of the partition wall (5) is greater than or equal to the check tailwater level.
5. The pipeline outlet structure of the drainage system of a hydropower station according to claim 2 is characterized by: A circular arc overflow weir is provided on the top of the partition wall (5).
6. The pipeline outlet structure of the drainage system of a hydropower station according to claim 1, characterized in that: The overflow structure comprises a drainage pipe (1), the drainage pipe (1) being connected to a vertically arranged overflow pipe (7), the outlet end of the overflow pipe (7) being arranged at the top of the drainage well (3).
7. The pipeline outlet structure of the drainage system of a hydropower station according to claim 6, characterized in that: The outlet elevation of the overflow pipe (7) is greater than or equal to the check tail water level.
8. The pipeline outlet structure of the drainage system of a hydropower station according to claim 6, characterized in that: The water outlet (4) is arranged at an angle.
9. The pipeline outlet structure of the drainage system of a hydropower station according to claim 1, characterized in that: A grille cover plate (6) is provided at the top of the overflow structure and the drainage well (3).