Vortex prevention system of pump room

Abstract

The invention relates to the technical field of pump station engineering, in particular to an anti-vortex system of a pump room, which comprises at least three vortex eliminating ring plates, a lifting component and a pressure pulsation sensor, the vortex eliminating ring plates are arranged on the outer side of a horn mouth, all the vortex eliminating ring plates are axially distributed along the horn mouth, and the pressure pulsation sensor is arranged on the lifting component. The vortex eliminating ring plates are all located above a water inlet of the horn mouth, the lifting component is used for driving the corresponding vortex eliminating ring plate to be close to or away from the adjacent vortex eliminating ring plate, the pressure pulsation sensor is used for obtaining the tangential flow velocity and vortex frequency of vortex, and according to the tangential flow velocity, the vortex frequency and the water level difference, the pressure pulsation sensor is used for detecting the water level difference. And the lifting parts are controlled to drive the corresponding vortex eliminating ring plates to move. The time window for forming the suction vortex can be remarkably prolonged, the invalid operation time of the vortex eliminating device can be shortened, energy is remarkably saved, the water level adaptability is wide, the pump station efficiency is remarkably improved, potential safety hazards are reduced, and good application prospects are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump station engineering, in particular to a vortex prevention system for a pump house. BACKGROUND

[0002] In the water intake project of a coastal power plant, flow channel and pump house vortex (including surface suction vortex, wall vortex and through vortex) is the core problem that threatens the safety of water intake. Vortex can induce water pump cavitation, unit vibration and flow imbalance, and even cause equipment damage or unplanned shutdown.

[0003] In the prior art, a vortex elimination beam / grid (0.5-1 times the pipe diameter from the suction inlet) is often arranged, or a cross beam or grid structure (porosity 60%-70%) is used to break the vortex core, but the vortex elimination beam may cause new vortex vibration, the grid is easy to block and increase flow resistance, and tidal fluctuation (such as ±3 m) will cause the critical submergence depth to fail, and wave disturbance will aggravate the instability of flow pattern. SUMMARY

[0004] The purpose of the present application is to solve the problem of poor applicability of the vortex elimination structure in the prior art, and to provide a vortex prevention system for a pump house.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is: A vortex prevention system for a pump house is provided, which comprises vortex elimination ring plates, lifting components and pressure pulsation sensors. The vortex elimination ring plates are at least three, and are arranged outside the horn mouth. All the vortex elimination ring plates are distributed along the axial direction of the horn mouth. The vortex elimination ring plates are all located above the water inlet of the horn mouth. The lifting components are used to drive the corresponding vortex elimination ring plates to move close to or away from the adjacent vortex elimination ring plates. The pressure pulsation sensors are used to obtain the tangential flow velocity and vortex frequency of the vortex. According to the tangential flow velocity, vortex frequency and water level difference, the lifting components are controlled to drive the corresponding vortex elimination ring plates to move.

[0006] The water level difference is the difference between the current tidal level and the water level of the water inlet of the horn mouth. The positions of all the vortex elimination ring plates are adjusted (such as moving as a whole or adjusting the spacing, etc.) according to the water level difference, so that they are distributed within the water level difference range and all below the tidal level, ensuring the effectiveness of vortex elimination, thereby adapting to a tidal level change range of up to ±3.2 m, and significantly improving the existing difficulties.

[0007] The lifting components can be of a conventional type, such as hydraulic, lead screw, etc.

[0008] The inner and outer diameters, thickness, initial arrangement spacing, etc. of the vortex elimination ring plates are set according to actual needs. The direction and distance of movement are considered according to actual conditions, such as tidal level, spacing between adjacent vortex elimination ring plates, stroke of the lifting components, etc.

[0009] The tangential flow velocity can be calculated by the pressure fluctuation sensor array using a cross-correlation algorithm, and the vortex frequency can be extracted from the sampling data by the main peak frequency of the spectrum of the pressure fluctuation signal through FFT transformation.

[0010] The vortex prevention system of the pump house has a plurality of vortex elimination ring plates located above the water inlet, which are free of edges and breaks, and the water flow is smooth when the water flows through, and the axial movement is used for vortex elimination, which can avoid new vortex vibration or additional flow resistance, each vortex elimination ring plate is independently driven by the lifting component to change the water flow state and block the formation of vortex flow, the movement of each vortex elimination ring plate is more flexible, and the vortex elimination mode can be selected according to the actual situation of vortex flow, so that the vortex elimination strategy can be finely adjusted, the time window for forming the air suction vortex can be significantly prolonged, the invalid operation time of the vortex elimination device can be reduced, energy can be saved significantly, the water level adaptability is wide, the efficiency of the pump station can be improved, the safety hidden danger can be reduced, and the vortex prevention system has a good application prospect.

[0011] Preferably, the vortex elimination ring plate is provided with a plurality of baffle plates arranged at intervals towards the water inlet side of the bell mouth, the baffle plates are arranged along a two-dimensional spiral line on the plate surface of the vortex elimination ring plate, and the baffle plates are provided with turbulence holes.

[0012] Preferably, the spiral angle of the baffle plate arrangement is 30-45°, and the diameter of the turbulence hole is 1-1.2 cm.

[0013] The spiral angle is the included angle between the tangent of the baffle plate and the radial direction of the vortex elimination ring plate.

[0014] Preferably, the diameters of the vortex elimination ring plates are different.

[0015] Preferably, the diameters of the vortex elimination ring plates gradually increase from the water inlet side close to the bell mouth to the water inlet side away from the bell mouth.

[0016] Preferably, the lifting component is located between the vortex elimination ring plate and the bell mouth.

[0017] Preferably, the lifting component comprises a screw rod, and rotating the screw rod can drive the corresponding vortex elimination ring plate to move.

[0018] By adopting the above arrangement, new vortexes can be further avoided, and the device size is also more compact.

[0019] Preferably, the vortex elimination ring plate is connected with at least two screw rods, and the screw rods of the same vortex elimination ring plate are uniformly distributed in the circumferential direction of the corresponding vortex elimination ring plate.

[0020] Preferably, the pressure fluctuation sensor has at least 4, and the pressure fluctuation sensor is arranged at the end of the corresponding screw rod towards the water inlet side of the bell mouth.

[0021] The screw rod of the lifting component is used as a mounting platform of the sensor, and the sensor is mounted on the mounting platform, which is beneficial to improving the accuracy of data acquisition.

[0022] Preferably, the vortex elimination ring plates are three, when the tangential velocity of the collected vortex is <0.5 m / s and / or the vortex frequency is <2 Hz, the uppermost vortex elimination ring plate is moved; when the tangential velocity of the collected vortex is 0.5-1 m / s and / or the vortex frequency is 2-3 Hz, the middle vortex elimination ring plate is moved; when the tangential velocity of the collected vortex is >1 m / s and <2 m / s and / or the vortex frequency is >3 Hz and <5 Hz, the lowermost vortex elimination ring plate is moved; when the tangential velocity of the collected vortex is ≥2 m / s and / or ≥5 Hz, all the vortex elimination ring plates are moved.

[0023] In conclusion, due to the adoption of the technical scheme, the application has the following beneficial effects: 1. The vortex prevention system of the pump house adopts a plurality of vortex elimination ring plates above the water inlet, and has no edges and corners and no breaks, so that the water flow is smooth when the water body flows through, and the vortex elimination is achieved by changing the water flow state and blocking the formation of vortex flow through the lifting component for independently driving each vortex elimination ring plate, so that the time window of the air suction vortex formation can be significantly prolonged, the invalid operation time of the vortex elimination device can be reduced, energy saving is significant, the water level adaptability is wide, the pump station efficiency is significantly improved, the safety hidden danger is reduced, and the vortex elimination strategy can be finely adjusted according to the actual situation of the vortex flow. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic diagram of a vortex prevention system of a pump house. Figure 2 It is a connection schematic diagram of the vortex elimination ring plate and the screw rod.

[0025] The figure mark: 1-vortex elimination ring plate, 11-baffle, 2-horn, 3-pressure pulsation sensor, 4-screw rod. DETAILED DESCRIPTION

[0026] The application will be described in detail below with reference to the drawings.

[0027] In order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application, and are not used to limit the application.

[0028] In the description of specific embodiments of the present application, the terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer" and the like are expressed based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product / device / apparatus of the present application is usually used, unless otherwise specified. These terms of orientation or positional relationship are only for the convenience of describing the present application or simplifying the description in specific embodiments, for the purpose of facilitating the understanding of the scheme by the skilled person, and therefore cannot be understood as indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "horizontal", "vertical", "overhanging", "parallel" and the like do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to mean that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel" and the like, and can have an error / deviation of ±10% with respect to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present application.

[0030] In addition, the terms "first", "second", "third" and the like in the terms are only used to distinguish the same or similar components for description, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0031] In addition, in the description of embodiments of the present application, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, and even more than 9.

[0032] In addition, in the description of the technical scheme of the present application, unless otherwise specified / limited / limited, the terms "arrangement", "installation", "connection", "connection", "provided with", "laid", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, such as welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication between two elements.

[0033] Example 1 As Figures 1-2 shown, the vortex prevention system of a pump house adopted by the present application comprises vortex elimination ring plates 1, lifting components and pressure pulsation sensors 3, the vortex elimination ring plates 1 are three, the vortex elimination ring plates 1 are arranged outside the trumpet mouth 2, all the vortex elimination ring plates 1 are distributed along the axial direction of the trumpet mouth 2, the vortex elimination ring plates 1 are all located above the water inlet of the trumpet mouth 2, the lifting components are used to drive the corresponding vortex elimination ring plates 1 to move close to or away from the adjacent vortex elimination ring plates 1, the pressure pulsation sensors 3 are used to obtain the tangential velocity and vortex frequency of the vortex flow, and the corresponding vortex elimination ring plates 1 are moved by the lifting components according to the tangential velocity, vortex frequency and water level difference.

[0034] Specifically, the vortex elimination ring plates 1 are arranged in the form of three annular plates, the corners of the vortex elimination ring plates 1 are all arc chamfered, the vortex elimination ring plates 1 are concentrically arranged outside the trumpet mouth 2 and distributed along the axial direction (vertical direction) of the trumpet mouth 2, and the diameters of the three vortex elimination ring plates 1 are all the same. The thickness and width of the vortex elimination ring plates 1 are set according to the requirements, for example, the thickness is 2-3 cm and the width is 10-15 cm, the material can be stainless steel, and the initial position is below the tide level. The initial arrangement interval of the vortex elimination ring plates 1 and the stroke range of the lifting components are set according to the conditions such as the tidal level variation interval, so as to adjust the positions of the vortex elimination ring plates 1 according to the water level difference and ensure that all the vortex elimination ring plates 1 are always immersed in water.

[0035] The vortex elimination ring plates 1 are provided with a plurality of baffle plates 11 arranged at intervals on the side facing the water inlet of the trumpet mouth 2, the baffle plates 11 are arranged along a two-dimensional spiral line on the surface of the vortex elimination ring plates 1, the baffle plates 11 are provided with turbulence holes, the spiral angle of the baffle plates 11 is 30°-45°, and the diameter of the turbulence holes is 1-1.2 cm. The height of the baffle plates 11 is set according to the actual requirements.

[0036] The lifting components are located between the vortex elimination ring plates 1 and the trumpet mouth 2. Specifically, the lifting components in the embodiment comprise screw rods 4, and rotating the screw rods 4 can drive the corresponding vortex elimination ring plates 1 to move. Each vortex elimination ring plate 1 is connected to two oppositely arranged screw rods 4 through a ring sleeve, and the screw rods 4 of each lifting component are uniformly and evenly distributed in the circumferential direction of the trumpet mouth 2. The lifting components are effectively arranged in the gap between the trumpet mouth 2 and the vortex elimination ring plates 1, the structure is more compact, and the moving speed of the vortex elimination ring plates 1 is set according to the actual situation.

[0037] The pressure pulsation sensors 3 are at least four, and the pressure pulsation sensors 3 are arranged at the end of the corresponding screw rod 4 on the side facing the water inlet of the trumpet mouth 2, as Figure 1 shown, all the pressure pulsation sensors 3 are uniformly and evenly distributed in the circumferential direction of the trumpet mouth 2, and the pressure pulsation sensors 3 can be as close to the water inlet of the trumpet mouth 2 as possible.

[0038] It also includes a control system, which has pre-stored control strategies, such as whether to move the vortex-suppressing ring plate 1, which vortex-suppressing ring plates 1 to move, the moving distance, and the moving direction, so as to control the lifting component to drive the corresponding vortex-suppressing ring plate 1 to move according to the tangential flow velocity, vortex frequency, and water level difference. The moving direction to adapt to the tidal level according to the change in water level difference is determined according to the actual situation. The moving direction for direct vortex suppression can be considered towards the side of the inlet (downward) or away from the side of the inlet (upward), and the lowest point can be flush with the plane of the inlet.

[0039] Specifically, when the tangential velocity of the collected eddy current is <0.5 m / s and / or the eddy frequency is <2 Hz, the uppermost eddy current suppressing ring plate 1 is moved; when the tangential velocity of the collected eddy current is 0.5 m / s-1 m / s and / or the eddy frequency is 2-3 Hz, the middle eddy current suppressing ring plate 1 is moved; when the tangential velocity of the collected eddy current is >1 m / s and <2 m / s and / or the eddy frequency is greater than or >3 Hz and <5 Hz, the lowermost eddy current suppressing ring plate 1 is moved; when the tangential velocity of the collected eddy current is ≥2 m / s and / or ≥5 Hz, all eddy current suppressing ring plates 1 are moved. The movement can be upward or downward, and the control strategy (including direction and distance) considers the current tide level and the current position of the eddy current suppressing ring plate 1, etc.

[0040] In some alternative embodiments, the number of anti-vortex ring plates 1 can be increased, such as 4, 5, etc.

[0041] In some alternative embodiments, the diameter of the vortex-suppressing ring plate 1 varies, starting from near the inlet of the bell mouth 2 ( Figure 1 (below) away from the inlet ( Figure 1 The vortex-eliminating rings increase in size sequentially from top to bottom, and the planar projections of two adjacent rings overlap. Each vortex-eliminating ring 1 has approximately the same width, and all vortex-eliminating rings 1 are located above the inlet of the bell-shaped opening 2.

[0042] In some alternative embodiments, the lifting component may also be located on the outside of the anti-vortex ring plate 1, and the lifting component may also be driven to move the anti-vortex ring plate 1 by means of a device such as hydraulic pressure.

[0043] The anti-vortex system for a pumping station described in this invention employs several anti-vortex ring plates located above the water inlet. These plates are free of sharp edges and breaks, ensuring smooth water flow. Furthermore, the axial movement of the ring plates eliminates vortices, preventing the initiation of new vortex vibrations or additional flow resistance. Each anti-vortex ring plate is independently driven by a lifting component to alter the water flow pattern and block vortex formation. The movement of each ring plate is more flexible, and the anti-vortex method can be selected based on the actual vortex conditions, facilitating precise adjustment of the anti-vortex strategy. This significantly extends the time window for the formation of intake vortices and reduces the ineffective operating time of the anti-vortex device, resulting in significant energy savings, wide water level adaptability, significantly improved pumping station efficiency, and reduced safety hazards, demonstrating promising application prospects.

[0044] The above merely provides the preferred embodiments of the application, and is not intended to limit the application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the application shall fall within the protection scope of the application.

Claims

1. A vortex-proof system for a pump house, characterized in that, The device includes a vortex suppressor plate (1), a lifting component, and a pressure pulsation sensor (3). There are at least three vortex suppressor plates (1). The vortex suppressor plates (1) are located outside the horn mouth (2). All the vortex suppressor plates (1) are distributed along the axial direction of the horn mouth (2). The vortex suppressor plates (1) are all located above the water inlet of the horn mouth (2). The lifting component is used to move the corresponding vortex suppressor plate (1) closer to or away from the adjacent vortex suppressor plate (1). The pressure pulsation sensor (3) is used to obtain the tangential velocity and vortex frequency of the vortex. Based on the tangential velocity, vortex frequency, and water level difference, the lifting component is controlled to move the corresponding vortex suppressor plate (1).

2. A vortex-proof system for a pump house according to claim 1, characterized in that, The anti-vortex ring plate (1) is provided with a number of baffles (11) arranged at intervals on the side facing the water inlet of the horn mouth (2). The baffles (11) are arranged along a two-dimensional spiral line on the plate surface of the anti-vortex ring plate (1), and the baffles (11) are provided with turbulence holes.

3. A vortex-proof system for a pump house according to claim 2, characterized in that, The baffle (11) is arranged with a helix angle of 30°-45° and the diameter of the turbulence hole is 1-1.2cm.

4. The anti-vortex system for a pump house according to claim 1, characterized in that, The diameters of the anti-vortex ring plate (1) are different.

5. The anti-vortex system for a pump house according to claim 4, characterized in that, The diameter of the anti-vortex ring plate (1) gradually increases from the side near the inlet of the horn mouth (2) to the side away from the inlet of the horn mouth (2).

6. A vortex-proof system for a pump house according to any one of claims 1-5, characterized in that, The lifting component is located between the anti-vortex ring plate (1) and the horn mouth (2).

7. The anti-vortex system for a pump house according to claim 6, characterized in that, The lifting component includes a screw (4), and rotating the screw (4) can drive the corresponding anti-vortex ring plate (1) to move.

8. The anti-vortex system for a pump house according to claim 7, characterized in that, The anti-vortex ring plate (1) is connected to at least two screws (4), and several screws (4) of the same anti-vortex ring plate (1) are evenly distributed along the circumference of the corresponding anti-vortex ring plate (1).

9. The anti-vortex system for a pump house according to claim 8, characterized in that, There are at least four pressure pulsation sensors (3), and the pressure pulsation sensors (3) are located at the end of the screw (4) facing the water inlet of the horn (2).

10. The anti-vortex system for a pump house according to claim 9, characterized in that, There are three eddy current suppression ring plates (1). When the tangential velocity of the collected eddy current is <0.5m / s and / or the eddy frequency is <2Hz, the uppermost eddy current suppression ring plate (1) is moved; when the tangential velocity of the collected eddy current is 0.5m / s-1m / s and / or the eddy frequency is 2-3Hz, the middle eddy current suppression ring plate (1) is moved; when the tangential velocity of the collected eddy current is >1m / s and <2m / s and / or the eddy frequency is greater than or >3Hz and <5Hz, the lowermost eddy current suppression ring plate (1) is moved; when the tangential velocity of the collected eddy current is ≥2m / s and / or ≥5Hz, all the eddy current suppression ring plates (1) are moved.

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