Inflation-adjustable vortex eliminating device at forebay outlet of high-flow pump station

Abstract

The utility model relates to an inflation adjustable vortex eliminating device for a forebay outlet of a large-flow pump station, which comprises a pump station and a water inlet forebay, the inside of the pump station is divided into a plurality of water inlet flow channels through isolation piers, a water pump is arranged in each water inlet flow channel, the isolation piers extend into the water inlet forebay, and the front ends, corresponding to inlets of the water inlet flow channels, of the isolation piers extend forwards to be provided with partition walls. An adjustable vortex eliminating device is arranged in front of an inlet in the water inlet runner between the adjacent partition walls, the adjustable vortex eliminating device comprises a vortex eliminating plate with an adjustable inclination angle, the vortex eliminating plate is obliquely mounted in the water inlet runner and is partially above the water surface, and a horizontal rotating shaft is fixed in the middle of the vortex eliminating plate in the inclination direction; the two ends of the rotating shaft are rotationally installed in the partition walls through bearings respectively, fan-shaped grooves for containing the ends of the vortex eliminating plates to swing when the vortex eliminating plates rotate are formed in the positions, corresponding to the partition walls, of the two sides of the vortex eliminating plates in the horizontal direction, and air bags with the variable sizes are arranged on the plate parts, not below the water surface, of the vortex eliminating plates and used for controlling and adjusting the inclination angles of the vortex eliminating plates.

Description

Technical Field

[0001] The utility model relates to the technical field of the design of pump station flow channels in water conservancy projects, in particular to an inflatable adjustable vortex elimination device at the outlet of the forebay of a large-flow pump station, which is mainly used to eliminate the vertical axis vortex at the outlet of the forebay of a low-lift pump station, that is, at the inlet of the intake flow channel, and prevent the vertical axis vortex from evolving into a suction vortex, thereby causing problems such as unit vibration and unstable operation. Background Art

[0002] Due to the characteristics of large flow, low lift and high efficiency, low-lift pump stations are widely used in agricultural irrigation, water diversion projects, urban drainage and other fields in plain areas. In order to give full play to the comprehensive benefits of water conservancy projects, low-lift pump stations are often arranged together with hydraulic structures such as check gates and ship locks, which easily causes the incoming flow of the diversion channel to enter the forebay of the pump station obliquely, thus affecting the flow pattern of the forebay, resulting in a lateral flow velocity in front of the inlet of the intake flow channel, forming a vertical axis vortex. When the vertical axis vortex is serious, it will generate a suction vortex band, causing unit vibration and affecting the operation efficiency and stability of the unit.

[0003] At present, there are already various measures to eliminate the vortices in the forebay of low-lift pump stations, such as guide piers, guide grids and bottom sills. These measures are often used in combination to achieve a better rectification and vortex elimination effect. However, these rectification and vortex elimination measures are mainly aimed at the large-scale vortices and backflows in the forebay of the pump station, and it is difficult to eliminate the local vertical axis suction vortex in front of the inlet of the flow channel. In order to eliminate the vertical axis suction vortex at the inlet of the intake flow channel of a low-lift pump station, measures such as vortex elimination plates are usually adopted. However, if pump stations with different design flows and design water levels use the same type of vortex elimination plate or the same pump station uses the same type of vortex elimination plate under different operating conditions, it will often cause problems such as poor vortex elimination effect and increased hydraulic loss. Therefore, an inclined vortex elimination plate designed according to the characteristic parameters of the pump station is needed, so that when it is applied to pump stations with different characteristic parameters, it can well eliminate the vertical axis vortex at the inlet of the intake flow channel and does not increase the hydraulic loss of the flow channel. Content of the Utility Model

[0004] Aiming at the problems of poor vortex elimination effect and increased hydraulic loss of the fixed inclined vortex elimination plate in the forebay of the pump station in the current technology, the utility model provides an inflatable adjustable vortex elimination device at the outlet of the forebay of a large-flow pump station, which is provided with a vortex elimination plate with an adjustable inclination angle, so that it can well eliminate the vertical axis suction vortex in front of the inlet of the intake flow channel and does not increase the hydraulic loss of the flow channel under different water levels and flows.

[0005] The object of the present utility model is achieved as follows. An inflatable adjustable vortex elimination device at the outlet of the forebay of a large-flow pumping station includes a pumping station and a forebay. A number of water inlet channels are separated by piers within the pumping station, and a water pump is arranged in each water inlet channel. The piers extend into the forebay, and the front ends of adjacent piers correspond to the inlets of the water inlet channels. It is characterized in that a partition wall extends forward at the front end of the pier corresponding to the inlet of the water inlet channel, and an adjustable vortex elimination device is arranged in front of the inlet of the water inlet channel between adjacent partition walls. The adjustable vortex elimination device includes a vortex elimination plate with an adjustable inclination angle. The vortex elimination plate is inclined and installed in the water inlet channel and partially floats above the water surface. A horizontal rotating shaft is fixed in the middle of the plate of the vortex elimination plate along the inclined direction. Both ends of the rotating shaft are rotatably installed in the partition wall through bearings. Sector-shaped grooves for accommodating the swinging of the end of the vortex elimination plate when the vortex elimination plate rotates are arranged at the positions corresponding to the partition walls on both sides of the vortex elimination plate in the horizontal direction. A gas bag with a variable volume is arranged on the plate part of the vortex elimination plate submerged below the water surface to control and adjust the inclination angle of the vortex elimination plate.

[0006] In the inflatable adjustable vortex elimination device of the present utility model, the vortex elimination plate is arranged at the outlet of the forebay of the pumping station, is supported and installed through a rotating shaft, and changes the buoyancy of the water-immersed end of the vortex elimination plate by changing the volume of the gas bag, so that the vortex elimination plate rotates around the rotating shaft, thereby adjusting the inclination angle of the vortex elimination plate, enabling the vortex elimination plate to adjust an appropriate inclination angle according to different water levels and flow rates of the water inlet channels, so as to eliminate the vertical-axis suction vortex and avoid increasing the hydraulic loss of the flow channel.

[0007] To facilitate the fixation of the gas bag to the vortex elimination plate, a frame for fixing the gas bag is arranged on the plate surface of the vortex elimination plate submerged under water. The gas bag is limited and fixed between the frame and the vortex elimination plate. The top of the gas bag is connected with a solenoid valve through an air charging pipe, and the solenoid valve is connected with an air charging device through an air charging pipe.

[0008] To facilitate maintaining the inclination angle of the adjusted vortex elimination plate, a spring is arranged in the sector-shaped groove corresponding to the plate end of the vortex elimination plate floating above the water surface. One end of the spring is fixed to the vortex elimination plate, and an extension groove for accommodating the spring is arranged on the radial side wall of the sector-shaped groove corresponding to the other end of the spring. The other end of the spring is fixedly abutted in the extension groove. The elastic force of the spring on the vortex elimination plate is opposite to the buoyancy force of the gas bag on the vortex elimination plate. During the process of the buoyancy force generated by the inflation and expansion of the gas bag gradually increasing, it overcomes the elastic force of the spring to change the deflection angle of the vortex elimination plate, thereby changing the inclination angle of the vortex elimination plate.

[0009] Furthermore, the gas bag and the frame are arranged on the back water surface of the vortex elimination plate.

[0010] Still further, the solenoid valve is a normally closed solenoid valve.

[0011] To further facilitate the support installation of the rotating shaft and the partition wall, a bearing seat is provided in the partition wall corresponding to the bearing. Two fan-shaped grooves are respectively arranged on both sides of the bearing seat in the radial direction, and are respectively used to accommodate the plate ends on both sides of the vortex elimination plate relative to the rotating shaft.

[0012] Furthermore, the thickness of the vortex elimination plate is 0.02D - 0.04D, the plate length in the inclined direction of the vortex elimination plate is 2D - 3D, where D is the diameter of the water pump impeller of the low-lift pumping station. The bottom plate edge of the vortex elimination plate submerged in the water surface is arc-shaped.

[0013] Still further, the angle at which the vortex elimination plate is inclined relative to the horizontal plane is 30° - 60°. The elevation of the center of the rotating shaft is equal to the elevation of the lowest water level of the inlet water passage. The horizontal distance from the center of the rotating shaft to the inlet of the inlet water passage is 4D - 5D.

[0014] Compared with the fixed vortex elimination plate structure of the prior art, the inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station of the present invention has the following beneficial effects:

[0015] 1. In the present invention, by controlling the volume of the airbag, the buoyancy force received by the vortex elimination plate is changed, and at the same time, the elastic force of the spring is overcome and appropriate elastic deformation occurs to make the vortex elimination plate incline at an angle suitable for vortex elimination and maintain balance, so as to achieve the purpose of vortex elimination. The inclination angle of the vortex elimination plate can be dynamically adjusted according to the changes of water level, water flow rate and flow velocity to achieve vortex elimination, with strong adaptability and convenient adjustment;

[0016] 2. The installation position and placement angle of the vortex elimination plate of the present invention are determined by the characteristic parameters of the low-lift pumping station, so that it is applicable to low-lift pumping stations with different characteristic parameters and operating conditions, and achieves a good vortex elimination effect;

[0017] 3. The vortex elimination device of the present invention is used at the inlet of the inlet water passage of the low-lift pumping station. While eliminating the vertical-axis vortex, it does not increase the hydraulic loss, and the water flow is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station of the present invention.

[0019] Figure 2 is Figure 1 a sectional view along the position of A-A.

[0020] Figure 3 It is an installation schematic diagram of the vortex elimination plate relative to the lowest moving water level.

[0021] Figure 4 It is an installation schematic diagram between the adjustable vortex elimination device and the partition wall.

[0022] Figure 5 is Figure 4Schematic diagram of the adjustable vortex elimination device Figure 1 。

[0023] Figure 6 Schematic diagram of the adjustable vortex elimination device Figure 2 。

[0024] Figure 7 Schematic diagram of vortex elimination principle of the inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station of the present invention

[0025] Among them, 1 is the inlet forebay; 2 is the partition wall; 201 is the fan-shaped groove; 202 is the extended notch; 3 is the adjustable vortex elimination device; 301 is the vortex elimination plate; 302 is the rotating shaft; 303 is the airbag; 304 is the frame; 305 is the air inlet pipe; 306 is the spring; 4 is the pier; 5 is the inlet flow channel; 6 is the horizontal axis vortex Specific implementation mode

[0026] The present invention will be further described in detail below with reference to the accompanying drawings

[0027] As Figures 1-6 shown, it is the inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station of the present invention

[0028] Specifically, the inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station of the present invention is as Figure 1 and Figure 2 shown, including a pumping station and an inlet forebay 1. In the pumping station, several inlet flow channels 5 are separated by piers 4. A water pump is arranged in each inlet flow channel 5. The piers 4 extend into the inlet forebay 1. The front ends of adjacent piers 4 correspond to the inlets of the inlet flow channels. The front ends of the piers 4 corresponding to the inlets of the inlet flow channels extend forward to be provided with partition walls 2. An adjustable vortex elimination device 3 is arranged in front of the inlets of the inlet flow channels between adjacent partition walls 2. The adjustable vortex elimination device 3 is as Figure 3 — Figure 5 shown, including a vortex elimination plate 301 with an adjustable inclination angle. The vortex elimination plate 301 is inclined and installed in the inlet flow channel and partially floats above the water surface. A horizontal rotating shaft 302 is fixed in the middle of the plate of the vortex elimination plate 301 along the inclined direction. Both ends of the rotating shaft 302 are rotatably installed in the partition wall 2 through bearings. Fan-shaped grooves 201 for accommodating the swinging of the end parts of the vortex elimination plate are arranged at the positions corresponding to the partition wall 2 on both sides of the vortex elimination plate 301 in the horizontal direction. A variable-volume airbag 303 is arranged on the plate part of the vortex elimination plate 301 below the water surface for controlling and adjusting the inclination angle of the vortex elimination plate 301

[0029] To facilitate the fixation of the airbag 303 to the vortex elimination plate 301, a frame 304 for fixing the airbag 303 is provided on the underwater surface of the vortex elimination plate 301. The airbag 303 is limited and fixed between the frame 304 and the vortex elimination plate 301. To facilitate the control of the volume change of the airbag 303, a solenoid valve is connected to the top of the airbag 303 through an inflation tube 305. The solenoid valve is connected to an inflation device through the inflation tube. The inflation device can be an air pump or a gas storage cylinder or other devices that provide a pressure gas source. By controlling the opening and closing of the solenoid valve, the inflation and deflation of the airbag are realized. In the present utility model, the solenoid valve is a normally closed three-position five-way solenoid valve, which is opened when energized during adjustment, and can realize the inflation or deflation of the airbag to adjust the volume of the airbag.

[0030] To facilitate maintaining the inclination angle of the adjusted vortex elimination plate 301, a spring 306 is provided in the fan-shaped groove 201 corresponding to the plate end of the vortex elimination plate 301 above the water surface. One end of the spring 306 is fixed to the vortex elimination plate 301, and an extension notch 202 for accommodating the spring 306 is provided on the radial side wall of the fan-shaped groove corresponding to the other end of the spring 306. The other end of the spring 306 is fixedly abutted against the inside of the extension notch. After fixed installation, the spring is in an elastic pressing state and is pressed between the vortex elimination plate 301 and the extension notch 202. The elastic force of the spring 306 on the vortex elimination plate 301 is opposite to the buoyancy direction of the airbag 303 on the vortex elimination plate 301. During the process that the buoyancy generated by the inflation and expansion of the airbag 303 gradually increases, the elastic force of the spring 303 is overcome, and the deflection angle of the vortex elimination plate 301 changes, thereby changing the inclination angle of the vortex elimination plate 303. When the inclination angle reaches the angle that can effectively eliminate the groove shaft vortex, the inflation is stopped. At this time, the vortex elimination plate 303 maintains the foregoing inclination angle state, realizing a continuous and stable vortex elimination working state. In the present utility model, the airbag 303 and the frame 304 are arranged on the surface of the back water surface of the vortex elimination plate 301, that is, the side with the plate surface facing upward, and the spring 306 is arranged on the other side of the vortex elimination plate 301 with the plate surface facing downward relative to the rotating shaft 302.

[0031] To facilitate the support and installation of the rotating shaft 302 and the partition wall 2, a bearing seat is provided in the partition wall 2 corresponding to the rotating shaft 302. The bearing is fixed in the bearing seat. Two fan-shaped grooves 201 are respectively arranged on both sides of the bearing seat along the radial direction of the bearing seat, and are respectively used for accommodating the plate ends on both sides of the vortex elimination plate 301 relative to the rotating shaft 302.

[0032] To achieve a good vortex elimination effect, the vortex elimination plate 301 is generally an aluminum alloy plate or a metal plate suitable for long-term use underwater. The plate thickness is 0.02D to 0.04D, and the length of the inclined direction of the vortex elimination plate 301 is 2D to 3D. D is the diameter of the water pump impeller of the low-lift pumping station. The bottom plate edge of the vortex elimination plate 301 submerged in the water is arc-shaped, which can adapt to the impact of gentle water flow.

[0033] According to fluid mechanics simulation calculations, the angle of inclination of the vortex elimination plate 301 relative to the horizontal plane is 30° to 60°, the center elevation of the rotating shaft 302 is equal to the lowest water level elevation of the water inlet channel, and the horizontal distance between the center of the rotating shaft 302 and the inlet of the water inlet channel is 4D to 5D.

[0034] like Figure 7 As shown, the vortex elimination principle of the above-mentioned adjustable vortex elimination device of the utility model is that for the water conservancy hub built by the gate station, due to the oblique water inflow of the diversion channel, a lateral flow velocity is easily formed at the entrance of the water inlet flow channel, thereby causing a vertical axis suction vortex, causing vibration and unstable operation of the pump station unit. The utility model has an adjustable inclination angle. The vortex elimination plate 301 guides the water flow, so that part of the water flowing through the vortex elimination plate 301 flows to the bottom layer of the water inlet flow channel of the pump station, and the other part of the water flows upward, forcing the formation of a horizontal axis vortex 6, thereby avoiding the generation of a vertical axis suction vortex that is easy to entrain air into the flow channel, and preventing the unit from vibrating and unstable operation.

Claims

1. An inflatable adjustable vortex elimination device at the outlet of the forebay of a large-flow pumping station, comprising a pumping station and a forebay. A number of water inlet channels are separated by piers in the pumping station, and a water pump is arranged in each water inlet channel. The piers extend into the forebay, and the front ends of adjacent piers correspond to the inlets of the water inlet channels. A partition wall extends forward at the front end of the pier corresponding to the inlet of the water inlet channel. It is characterized in that, An adjustable vortex dissipation device is provided in front of the inlet in the water inlet flow channel between adjacent partition walls. The adjustable vortex dissipation device includes a vortex dissipation plate with an adjustable inclination angle. The vortex dissipation plate is inclined and installed in the water inlet flow channel and partially floats above the water surface. A horizontal rotating shaft is fixed in the middle of the plate of the vortex dissipation plate along the inclined direction. Both ends of the rotating shaft are rotatably installed in the partition wall through bearings. Sector-shaped grooves for accommodating the swinging of the end of the vortex dissipation plate when the vortex dissipation plate rotates are provided at the positions corresponding to the partition walls on both sides of the vortex dissipation plate in the horizontal direction. A gasbag with a variable volume is provided on the plate part of the vortex dissipation plate submerged below the water surface for controlling and adjusting the inclination angle of the vortex dissipation plate.

2. The inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station according to claim 1, characterized in that, A frame for fixing the gasbag is provided on the plate part of the vortex dissipation plate submerged underwater. The gasbag is limited and fixed between the frame and the vortex dissipation plate. The top of the gasbag is connected with a solenoid valve, and the solenoid valve is connected with an inflation device through an inflation pipe.

3. The inflatable adjustable vortex dissipation device at the outlet of the forebay of a large-flow pumping station according to claim 1, characterized in that A spring is provided in the sector-shaped groove corresponding to the plate end of the vortex dissipation plate floating above the water surface. One end of the spring is fixed to the vortex dissipation plate, and an extension notch for accommodating the spring is provided on the radial side wall of the sector-shaped groove corresponding to the other end of the spring. The other end of the spring is fixedly abutted in the extension notch. The elastic force of the spring on the vortex dissipation plate is opposite to the buoyancy force of the gasbag on the vortex dissipation plate. During the process of the buoyancy force generated by the inflation and expansion of the gasbag gradually increasing, it overcomes the elastic force of the spring to change the deflection angle of the vortex dissipation plate, thereby changing the inclination angle of the vortex dissipation plate.

4. The inflatable adjustable vortex dissipation device at the outlet of the forebay of the large-flow pumping station according to claim 2, characterized in that, The gasbag and the frame are arranged on the water-facing surface of the vortex dissipation plate.

5. The inflatable adjustable vortex dissipation device at the outlet of the forebay of the large-flow pumping station according to claim 2, characterized in that, The solenoid valve is a normally closed solenoid valve.

6. The inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station according to claim 1, characterized in that, Bearing seats are provided in the partition walls corresponding to the bearings. Two sector-shaped grooves are respectively provided on both sides of the bearing seat along the radial direction, and are respectively used for accommodating the plate ends on both sides of the vortex dissipation plate relative to the rotating shaft.

7. The inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station according to claim 1, characterized in that, The thickness of the vortex dissipation plate is 0.02D - 0.04D, the plate length of the vortex dissipation plate in the inclined direction is 2D - 3D, D is the diameter of the water pump impeller of the low-lift pumping station, and the bottom plate edge of the vortex dissipation plate submerged below the water surface is arc-shaped.

8. The inflatable adjustable vortex elimination device at the outlet of the forebay of the large-flow pumping station according to claim 7, characterized in that, The angle of inclination of the vortex dissipation plate relative to the horizontal plane is 30° - 60°. The elevation of the center of the rotating shaft is equal to the elevation of the lowest water level of the water inlet flow channel. The horizontal distance from the center of the rotating shaft to the inlet of the water inlet flow channel is 4D - 5D.

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