Power plant water inlet and outlet self-cleaning trash screen

Abstract

The utility model discloses a kind of power station water inlet and outlet self-cleaning dirt-blocking grating, including pivot (1), pivot (1) is located above the import of water inlet and outlet (2), both ends of pivot (1) are fixed with the ground of both sides of water inlet and outlet (2) by support (3), one end of pivot (1) is connected with motor (4), pivot (1) is equipped with multiple circumferential evenly distributed interception grating (5), front and back sides of pivot (1) are equipped with first pressure sensor (6) and second pressure sensor (7) respectively, first pressure sensor (6) and second pressure sensor (7) are located in water inlet and outlet (2), the outside of water inlet and outlet (2) is equipped with controller (8), motor (4), first pressure sensor (6) and second pressure sensor (7) are all connected controller (8).The utility model has the advantages of being suitable for use in water inlet and outlet with low frequency of use and being easy to use.

Description

Technical Field

[0001] This utility model belongs to the field of debris barrier grids at the inlet and outlet of power plants. Background Technology

[0002] Debris barriers are typically installed at the inlet and outlet of power plants, such as on the spillway. These barriers prevent floating debris like branches, plastic bags, and weeds from entering the spillway and reduce the likelihood of blockages. Surveys show that installing debris barriers can reduce spillway blockage rates by over 70%. Spillways are generally only used for emergency flood discharge and are not activated in most situations.

[0003] There are various types of existing trash racks, the most common being rectangular mesh racks welded with steel bars, fixed at the inlet and outlet. The drawback is that floating debris easily accumulates on the water-facing side of the trash rack, causing blockage. Once blocked, the floating debris adheres tightly to the trash rack due to the impact of the water flow, making it difficult to clear and inconvenient to use. Some trash racks have self-cleaning functions, such as the reservoir trash rack with self-cleaning function in application number 202410183056.9. This type of trash rack will not clog even after long-term use, but it has a complex structure, high cost, and a relatively high failure rate due to its complex structure, making it uneconomical for use at inlet and outlet points with low usage frequency. Utility Model Content

[0004] The purpose of this invention is to provide a self-cleaning debris barrier for power plant inlet and outlet. This invention has the advantages of being suitable for use at inlet and outlet locations with low operating frequency and being easy to use.

[0005] The technical solution of this utility model: a self-cleaning screen for the inlet and outlet of a power station, including a rotating shaft, the rotating shaft being located above the inlet of the inlet and outlet, both ends of the rotating shaft being fixed to the ground on both sides of the inlet and outlet via brackets, one end of the rotating shaft being connected to a motor, the rotating shaft being provided with multiple circumferentially evenly distributed screens, a first pressure sensor and a second pressure sensor being provided on the front and rear sides of the rotating shaft respectively, the first pressure sensor and the second pressure sensor being located inside the inlet and outlet, a controller being provided on the outside of the inlet and outlet, the motor, the first pressure sensor and the second pressure sensor being connected to the controller.

[0006] The aforementioned self-cleaning debris barrier grilles at the power plant inlet and outlet consist of four grilles.

[0007] In the aforementioned self-cleaning debris barrier at the inlet and outlet of the power station, the barrier includes a rectangular frame that matches the cross-sectional shape of the inlet and outlet. A mesh is provided on the water-facing side of the rectangular frame, one side of the mesh is rotatably connected to the rectangular frame, and the other side of the mesh is connected to the rectangular frame by a locking buckle.

[0008] In the aforementioned self-cleaning debris barrier at the inlet and outlet of the power station, the rectangular frame is equipped with a bar screen on both the water-facing and back-facing sides.

[0009] In the aforementioned self-cleaning trash rack at the power plant inlet and outlet, baffles are provided on the water-facing side of both the first pressure sensor and the second pressure sensor, and the baffles are fixed to the inner wall of the inlet and outlet.

[0010] In the aforementioned self-cleaning debris barrier at the inlet and outlet of the power station, the output end of the motor is provided with a worm gear, and a worm wheel connected to the rotating shaft is provided on one side of the worm gear.

[0011] Compared with existing technologies, this invention utilizes a motor-driven rotating shaft on the upper side of the inlet and outlet. The shaft has multiple intercepting grids, one of which enters the inlet / outlet to intercept debris. Two pressure sensors detect the water level difference before and after the intercepting grid to determine if it is blocked. When blocked, the motor activates, causing the grid to carry floating debris away from the water surface, allowing the next intercepting grid to enter and continue intercepting floating debris, thus achieving self-cleaning. This self-cleaning refers to the self-cleaning of the intercepting portion of the grid, specifically the grid entering the inlet / outlet. This invention has a simple structure, low cost, and no requirement for precise fit between parts, resulting in a lower failure rate. It is suitable for use at inlet / outlet locations with low usage frequency, such as in flood discharge channels. For intercepting grids carrying debris out of the water, management personnel only need to unlock the latch and rotate the grid; gravity will quickly remove the floating debris, making it convenient to use. Therefore, this invention has the advantages of being suitable for use at inlet / outlet locations with low usage frequency and being easy to use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of Example 1.

[0013] Figure 2 This is a top view of Example 1.

[0014] Figure 3 This is a schematic diagram of the interception grille in Example 1.

[0015] Figure 4 This is a schematic diagram of the controller's connection principle.

[0016] Figure 5 This is a schematic diagram of the structure of Example 2.

[0017] The labels in the attached diagram are: 1-rotating shaft, 2-flood discharge channel, 3-support, 4-motor, 5-interception grid, 6-first pressure sensor, 7-second pressure sensor, 8-controller, 9-rectangular frame, 10-grid, 12-baffle, 13-worm gear, 14-worm wheel. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] Example 1: Self-cleaning trash racks at the inlet and outlet of a power station, such as... Figures 1 to 4 As shown, it includes a rotating shaft 1, which is located above the inlet of the inlet / outlet 2. The rotating shaft 1 is held above the water surface of the inlet / outlet 2, and both ends of the rotating shaft 1 are fixed to the ground on both sides of the inlet / outlet 2 by brackets 3. In Example 1, the inlet / outlet 2 is the flood discharge channel of the power station reservoir.

[0020] Four circumferentially evenly distributed intercepting grids 5 are provided on the rotating shaft 1. One of the intercepting grids 5 is vertically inserted into the inlet / outlet 2 to perform the interception function. The intercepting grid 5 includes a rectangular frame 9. The inner beam of the intercepting grid 5 is formed on the rotating shaft 1. The inner beams of the four intercepting grids 5 are shared. The rectangular frame 9 is matched with the cross-sectional shape of the inlet / outlet 2. A grid mesh 10 is provided on the water-facing side of the rectangular frame 9. One side of the grid mesh 10 is rotatably connected to the rectangular frame 9, and the other side of the grid mesh 10 is connected to the rectangular frame 9 by a locking buckle.

[0021] A first pressure sensor 6 and a second pressure sensor 7 are respectively installed on the front and rear sides of the rotating shaft 1. Both the first pressure sensor 6 and the second pressure sensor 7 are located inside the inlet and outlet 2 and are at the same height. A baffle 12 is provided on the water-facing side of both the first pressure sensor 6 and the second pressure sensor 7, and the baffle 12 is fixed to the inner wall of the inlet and outlet 2. The first pressure sensor 6 and the second pressure sensor 7 are both model MS5837-30BA.

[0022] One end of the rotating shaft 1 is connected to a motor 4. The output end of the motor 4 is equipped with a worm gear 13, and a worm wheel 14 connected to the rotating shaft 1 is provided on one side of the worm gear 13. The reduction ratio of the worm wheel 14 to the worm gear 13 is 1:30, resulting in a rotational speed of 2 r / min for the rotating shaft 1. Preferably, a protective cover can be provided on the upper side of the motor 4, extending to the upper side of the worm gear 13 and the worm wheel 14. Utilizing the self-locking force between the worm gear and the worm, the intercepting grid 5 can be prevented from rotating due to water flow impact.

[0023] A controller 8 is located on the outside of the inlet / outlet 2. The motor 4, the first pressure sensor 6, and the second pressure sensor 7 are all connected to the controller 8. The controller 8 is an FX2N model and should be installed in a rainproof location. The motor 4 is a geared motor with an output speed of 60 r / min. The first pressure sensor 6 and the second pressure sensor 7 are both connected to the signal input terminal of the controller 8, and the motor 4 is connected to the relay output terminal of the controller.

[0024] Usage: A filter screen is always present in the inlet and outlet to perform its interception function. The first pressure sensor 6 and the second pressure sensor 7 detect the water pressure on the front and rear sides of the filter screen 5 in the inlet and outlet, respectively, and transmit the water pressure signals to the controller. The controller compares the two water pressure signals to obtain the pressure difference. When the pressure difference reaches a certain level, it indicates that there is a certain height difference between the water levels on the front and rear sides of the filter screen 5, and the filter screen 5 is blocked. The controller starts the motor 4 for a period of time, causing the shaft 1 to rotate 90°. The blocked filter screen 5 rotates towards the water-facing side and detaches from the water surface, allowing the next filter screen 5 to enter the inlet and outlet to continue its interception function, thus achieving a self-cleaning function. The self-cleaning mentioned here refers to the ability of the filter screen 5 located in the inlet and outlet to recover from a blocked state to a clean state (because it has been replaced), thereby achieving self-cleaning.

[0025] For the intercepting screen 5 that is detached from the water surface, the worker can open the latch, rotate the screen 10 upwards, and the debris on the screen 10 will slide off to the outside of the inlet and outlet, thus cleaning the intercepting screen 5. Then the latch can be closed again. The latch can be a bolt-type quick-locking clip, preferably two or more latches.

[0026] Example 2. Compared with Example 1, the difference is that the rectangular frame 9 is provided with a grid mesh 10 on both the water-facing side and the water-repellent side.

[0027] Comparing Example 2 with Example 1: Figure 1 As shown, in Example 1, cleaning the debris on the intercepting grid 5 requires waiting until it leaves the water surface and then rotates 90° again. Otherwise, once it reaches a vertical position, the debris will slide onto the next intercepting grid 5, making it more difficult to clean. In Example 2, cleaning the debris on the intercepting grid 5... Figure 5 As shown, the debris can be easily removed during the period from when it just leaves the water surface to when it rotates 90°, or during the period when it rotates another 90°. During the second period, although the debris has slid onto the next intercepting grid 5, since both sides of the intercepting grid 5 have mesh screens 10, simply rotating the mesh screens 10 on the next intercepting grid 5 will remove the debris. Example 2 provides managers with more time to clean up the debris.

[0028] Examples 1 and 2, compared to existing rectangular mesh grilles welded with steel bars, can promptly retrieve floating debris from the water for cleaning, making cleaning easier and more convenient to use, and quickly restoring the waterway's flow. Compared to existing self-cleaning debris barriers, the structure is simpler, the cost is lower, and it is less prone to failure. Although manual removal of retrieved floating debris is still required, it is relatively easy to clean because it is used at inlet and outlet water outlets with low usage frequency, and therefore does not pose a significant problem.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A self-cleaning debris barrier at the inlet and outlet of a power station, characterized in that: Includes a rotating shaft (1), which is located above the inlet of the inlet / outlet (2). Both ends of the rotating shaft (1) are fixed to the ground on both sides of the inlet / outlet (2) via brackets (3). One end of the rotating shaft (1) is connected to a motor (4). Multiple circumferentially evenly distributed intercepting grids (5) are provided on the rotating shaft (1). A first pressure sensor (6) and a second pressure sensor (7) are respectively provided on the front and rear sides of the rotating shaft (1). The first pressure sensor (6) and the second pressure sensor (7) are both located inside the inlet / outlet (2). A controller (8) is provided on the outside of the inlet / outlet (2). The motor (4), the first pressure sensor (6), and the second pressure sensor (7) are all connected to the controller (8).

2. The self-cleaning debris barrier at the inlet and outlet of the power station according to claim 1, characterized in that: There are four interception grilles (5).

3. The self-cleaning debris barrier at the inlet and outlet of the power station according to claim 1 or 2, characterized in that: The intercepting grid (5) includes a rectangular frame (9), which is matched with the cross-sectional shape of the inlet and outlet (2). A grid mesh (10) is provided on the water-facing side of the rectangular frame (9). One side of the grid mesh (10) is rotatably connected to the rectangular frame (9), and the other side of the grid mesh (10) is connected to the rectangular frame (9) by a latch.

4. The self-cleaning trash rack at the inlet and outlet of the power station according to claim 3, characterized in that: The rectangular frame (9) is provided with a grid (10) on both the water-facing side and the water-repellent side.

5. The self-cleaning trash rack at the inlet and outlet of the power station according to claim 1, characterized in that: Both the water-facing side of the first pressure sensor (6) and the water-facing side of the second pressure sensor (7) are provided with baffles (12), and the baffles (12) are fixed to the inner wall of the inlet and outlet (2).

6. The self-cleaning trash rack at the inlet and outlet of the power station according to claim 1, characterized in that: The output end of the motor (4) is provided with a worm (13), and a worm wheel (14) connected to the rotating shaft (1) is provided on one side of the worm (13).

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