A rotating self-cleaning trash rack suitable for a hydropower station

Abstract

The utility model discloses a kind of rotary self-cleaning type trash rack suitable for hydropower station, it is related to the field of water conservancy and hydropower engineering, including the rotating grate assembly erected in the water inlet passage both sides and the self-cleaning assembly installed on the rotating grate assembly, the self-cleaning assembly includes the trash scraping brush device arranged closely the rotating grate assembly and the sump installed below the trash scraping brush device;To solve the existing trash rack easy to block, frequent trash cleaning and artificial cooperation trash cleaning efficiency is low, high risk and labor intensity etc.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering, specifically to a rotating self-cleaning trash rack suitable for hydropower stations. Background Technology

[0002] Large amounts of debris often accumulate in front of the water intake of hydropower stations. The debris is diverse, including weeds, leaves, branches, plastic film, and animal carcasses. If it is not removed in time, it can affect the output of the generating units and cause power loss. In severe cases, it can block or even collapse the trash rack, endangering the normal operation of the power station and causing significant economic losses.

[0003] Most small and medium-sized hydropower stations currently use two vertical trash racks, a front rack and a rear rack, at the water intake to prevent debris from entering the generator unit. When the trash racks need cleaning, the front rack is lifted out of the water and the debris is manually removed before being put back into the water. Then the rear rack is lifted out of the water for cleaning, thus completing one cleaning process.

[0004] Traditional trash racks are mostly fixed bar structures, and their main disadvantages are:

[0005] Easy to clog: In waters with a lot of floating debris such as aquatic plants, duckweed, and plastic waste, the bars will quickly become clogged, leading to an increase in the water level difference (pressure difference) before and after the bars.

[0006] Impact on operation: A huge pressure differential will increase head loss, severely reduce unit efficiency, and even force the pumping station or power station to shut down.

[0007] Difficulties in cleaning up pollution: The cleaning work mainly relies on manual labor in conjunction with cleaning grab buckets or rake buckets, which is inefficient, dangerous, labor-intensive, and requires frequent cleaning up, as well as interruption of power generation or pumping operations, resulting in economic losses.

[0008] Secondary pollution: The sludge captured from the platform or riverbed will be scattered and require secondary treatment, which can easily cause secondary pollution to the environment. Utility Model Content

[0009] This invention provides a rotating self-cleaning trash rack suitable for hydropower stations, which solves the problems of existing trash racks being prone to clogging, requiring frequent cleaning, resulting in low efficiency, high risk, and high labor intensity due to manual cleaning.

[0010] To achieve the above objectives, this utility model provides the following solution:

[0011] A rotating self-cleaning trash rack suitable for hydropower stations includes a rotating rack assembly erected on both sides of the water intake channel and a self-cleaning component installed on the rotating rack assembly. The self-cleaning component includes a cleaning scraper device disposed close to the rotating rack assembly and a trash collection tank installed below the cleaning scraper device.

[0012] This invention uses a rotating grid assembly to block and collect dirt. The rotation of the grid assembly transports the dirt to a cleaning scraper, which then scrapes and washes the dirt from the grid assembly into a collection tank for centralized cleaning. This automated cleaning method promptly removes dirt, preventing blockages. The mechanical cleaning system reduces manpower and allows for continuous, 24 / 7 cleaning, preventing excessive dirt accumulation and ensuring thorough removal. Timely cleaning of the collected dirt in the tank also prevents secondary pollution.

[0013] Furthermore, the rotating grid assembly includes a main shaft, several spokes and a cylindrical support mesh, the spokes connecting the main shaft and the cylindrical support mesh, and the two ends of the main shaft being mounted on support members on both sides of the water inlet channel.

[0014] By setting up a cylindrical support net on both sides of the water inlet channel and immersing part of the cylindrical support net in the water, the purpose of blocking floating debris on the water surface is achieved. By adding power to the main shaft, the cylindrical support net is rotated, and the debris collected by the cylindrical support net is transported and removed from the water surface.

[0015] Furthermore, the rotating grid assembly also includes a plurality of trash rack plates uniformly installed on the outer periphery of the cylindrical support net.

[0016] Several arc-shaped trash racks are detachably installed on the outer periphery of the cylindrical support net, and are evenly distributed along the circumference of the cylindrical support net. The gaps between two adjacent trash racks form trash rack gaps.

[0017] Furthermore, the cleaning scraper device includes several scrapers that are closely attached to the cylindrical support net, and a scraping groove is provided between two adjacent scrapers. The scraping groove is located on the moving path of the trash rack, and the width of the scraping groove is equal to the thickness of the trash rack.

[0018] The scraper cuts and scrapes away the dirt collected on the cylindrical support net, while the scraper groove cuts and scrapes away the dirt collected on the trash rack. This method can scrape off the dirt collected on both the cylindrical support net and the trash rack together, preventing excessive dirt accumulation on the cylindrical support net and the trash rack from causing blockages.

[0019] Furthermore, the cleaning and scraping device also includes a high-pressure flushing device installed above the cylindrical support net. The high-pressure flushing device includes several nozzles facing the cylindrical support net, and all nozzles are connected to a high-pressure water pump through pipelines.

[0020] After cleaning with scrapers and grooves, the large volume of dirt accumulated on the cylindrical support net and trash rack has been removed. However, small volume dirt or stains may remain on the cylindrical support net and trash rack, which are difficult to remove. Over time, this accumulation will put a burden on the equipment and affect its lifespan. Therefore, a high-pressure flushing device is used to wash away these small volume dirt or stains to ensure the cleanliness of the equipment and extend its service life.

[0021] Furthermore, several of the nozzles are evenly distributed along the axis of the cylindrical support mesh.

[0022] Furthermore, the sidewall of the spoke is provided with a barrier plate for contacting the water flow, the barrier plate being perpendicular to the direction of the water flow.

[0023] Since the device needs to operate around the clock, meaning the cylindrical support net needs to rotate continuously to avoid blockage, using an electric drive would consume a lot of energy. Therefore, the main shaft is driven to rotate by water flow pushing the baffle plate, thereby driving the cylindrical support net to rotate, which reduces the overall energy consumption of the device.

[0024] Furthermore, the barrier plate corresponds one-to-one with the spoke plate.

[0025] Furthermore, a drain outlet is provided at one end of the sludge collection tank, and a screw conveyor is provided at the bottom of the sludge collection tank. The rotating shaft of the screw conveyor is connected to the main shaft for transmission.

[0026] The sludge collected in the sludge collection tank is transported towards the discharge outlet by a screw conveyor, and then discharged from the discharge outlet into a transport vehicle or other device. This facilitates the cleaning and transportation of the sludge and prevents excessive accumulation of sludge in the sludge collection tank from causing blockages.

[0027] Furthermore, a guide plate is provided above the sludge collection tank, and the guide plate is located below the sludge cleaning scraper device.

[0028] The guide plate collects the dirt removed by the scraper, scraper groove and high-pressure flushing device and guides it into the dirt collection tank, reducing the occurrence of dirt splashing out of the device and returning to the water body.

[0029] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0030] (1) This utility model uses a rotating grid assembly to block and collect dirt, and the rotating grid assembly transports the dirt to a cleaning scraper. The cleaning scraper scrapes and washes the dirt from the rotating grid assembly into the collection tank for collection, which is convenient for centralized cleaning. The automatic cleaning method cleans the dirt in time to prevent blockage. The automatic cleaning by the mechanical device reduces manpower consumption and can clean the dirt continuously around the clock to prevent the dirt from accumulating too much and becoming difficult to clean. The dirt collected in the collection tank is cleaned in time to prevent secondary pollution.

[0031] (2) The scraper cuts and scrapes the dirt collected on the cylindrical support net, while the scraper cuts and scrapes the dirt collected on the trash rack. This can scrape the dirt collected on the cylindrical support net and the trash rack together, avoiding excessive dirt accumulation on the cylindrical support net and the trash rack, which can cause blockage.

[0032] (3) The main shaft is driven to rotate by the water flow pushing the baffle plate, thereby driving the cylindrical support net to rotate, which reduces the overall energy consumption of the device;

[0033] (4) The sewage collected in the sewage collection tank is transported to the sewage outlet by the screw conveyor and discharged from the sewage outlet into the transport vehicle and other devices, which facilitates the cleaning and transportation of sewage and prevents excessive accumulation of sewage in the sewage collection tank from causing blockage. Attached Figure Description

[0034] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0035] Figure 1 This is a schematic diagram of the overall structure of the trash rack in this utility model;

[0036] Figure 2 This is a cross-sectional view of the rotating grid assembly in this utility model;

[0037] Figure 3 This is a schematic diagram of the cleaning and scraping device in this utility model;

[0038] Figure 4 This is a schematic diagram of the sludge collection tank structure in this utility model;

[0039] Among them, 1-rotating grid assembly, 101-main shaft, 102-spoke plate, 103-cylindrical support net, 104-support component, 105-trash grid plate, 106-barrier plate, 2-cleaning scraper device, 201-scraper, 202-scraper groove, 203-high pressure flushing device, 204-nozzle, 3-sludge collection tank, 301-sludge outlet, 302-screw conveyor, 303-sludge guide plate. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] Example 1

[0043] This embodiment provides a rotating self-cleaning trash rack suitable for hydropower stations, such as... Figures 1-4 As shown, it includes a rotating grid assembly 1 mounted on both sides of the water inlet channel and a self-cleaning component installed on the rotating grid assembly 1. The self-cleaning component includes a cleaning scraper 2 that is attached to the rotating grid assembly 1 and a sludge collection tank 3 installed below the cleaning scraper 2.

[0044] The length of the rotating grate assembly 1 is equal to the width of the water inlet channel to block as much dirt as possible. The lengths of the self-cleaning assembly and the sludge collection tank 3 are also equal to those of the rotating grate assembly 1 to facilitate cleaning of dirt on the rotating grate assembly 1. The device is provided with at least two mounting bases, which are installed on the banks on both sides of the water inlet channel. Then, the two ends of the rotating grate assembly 1, the self-cleaning assembly, and the sludge collection tank 3 are respectively mounted on the two mounting bases.

[0045] In a more preferred embodiment, the rotating grid assembly 1 includes a main shaft 101, a plurality of spokes 102 and a cylindrical support net 103. The spokes 102 connect the main shaft 101 and the cylindrical support net 103. The two ends of the main shaft 101 are respectively mounted on the support members 104 on both sides of the water inlet channel.

[0046] Two support members 104 are fixedly installed on the banks on both sides of the water intake channel. They can be installed directly on the bank or on a mounting base. The main shaft 101 is connected to the support member 104 through a bearing. The number of spokes 102 is arbitrary and they are evenly installed on the main shaft 101. The cylindrical support net 103 is made by rolling existing flat mesh into a cylindrical shape and is connected to the spokes 102 by welding or other methods.

[0047] In a more preferred embodiment, the rotating grid assembly 1 further includes a plurality of trash rack plates 105 uniformly installed on the outer periphery of the cylindrical support net 103.

[0048] The trash rack 105 is an arc-shaped sheet structure that is detachably connected to the outer periphery of the cylindrical support net 103 by bolts or the like. During installation, it is installed circumferentially around the axis of the cylindrical support net 103. The circumferential distance between two adjacent installations is arbitrary, but preferably set according to the mesh spacing of the cylindrical support net 103.

[0049] In a more preferred embodiment, the cleaning scraper device 2 includes a plurality of scrapers 201 that are close to the cylindrical support net 103, and a scraping groove 202 is provided between two adjacent scrapers 201. The scraping groove 202 is located on the moving path of the trash rack 105, and the width of the scraping groove 202 is equal to the thickness of the trash rack 105.

[0050] The cleaning scraper device 2 is also equipped with a blade holder mounted on the support member 104 at both ends. The scrapers 201 are evenly distributed on the blade holder. The blades of the scrapers 201 are in contact with the outer surface of the cylindrical support net 103, preferably with a small gap to prevent wear. The width of the scrapers 201 is equal to the distance between two adjacent trash racks 105 along the axis of the cylindrical support net 103, and the blades of the scrapers 201 are installed in the same direction as the axis of the cylindrical support net 103. The scraper grooves 202 are the gaps between two adjacent scrapers 201, and their width is equal to the thickness of the trash racks 105. The number and position of the scraper grooves 202 correspond one-to-one with the number and position of the circumference on which the trash racks 105 are installed.

[0051] In a more preferred embodiment, the cleaning and scraping device 2 further includes a high-pressure flushing device 203 installed above the cylindrical support net 103. The high-pressure flushing device 203 includes a plurality of nozzles 204 facing the cylindrical support net 103, and the nozzles 204 are all connected to a high-pressure water pump through pipelines.

[0052] The high-pressure flushing device 203 includes a mounting frame with both ends supported on two support members 104. The nozzles 204 are evenly arranged along the lower end of the mounting frame. The pipeline connecting the high-pressure water pump and the nozzles 204 can be an external pipeline wrapped around the mounting frame to prevent it from falling, or it can be a pipeline opened inside the mounting frame to make the device look simpler. The total length of the high-pressure water flow sprayed by the nozzles 204 is preferably greater than the length of the axis of the cylindrical support net 103 to facilitate the water flow covering the cylindrical support net 103.

[0053] In a more preferred embodiment, a plurality of the nozzles 204 are evenly distributed along the axis of the cylindrical support mesh 103.

[0054] Example 2

[0055] Based on Example 1, such as Figures 1-4As shown, the side wall of the spoke 102 is provided with a barrier plate 106 for contacting the water flow, and the barrier plate 106 is perpendicular to the direction of water flow; the barrier plate 106 corresponds one-to-one with the spoke 102.

[0056] The baffle plate 106 is preferably installed on the spoke plate 102 near one end of the cylindrical support net 103 to facilitate water flow contact and obtain power; the cylindrical support net 103 can operate in two ways:

[0057] Firstly, the spokes 102 are directly fixed to the main shaft 101. The water flow pushes the baffle plate 106 to rotate downwards, so that the lower end of the cylindrical support net 103 rotates in the same direction as the water flow. At this time, the dirt blocked and collected by the cylindrical support net 103 first enters the water, and after exiting the water, it is cleaned by the scraper 201 and the groove 202, and falls into the dirt collection tank 3 for collection. In this method, the dirt needs to enter the water first and then exit the water. There is a possibility that it will be washed away by the water flow and detached from the cylindrical support net 103 in advance, which reduces the cleaning effect.

[0058] Secondly, the main shaft 101 includes an inner shaft and an outer shaft arranged coaxially, with bearings separating the inner and outer shafts. The two ends of the inner and outer shafts are connected by gear transmission, and an odd number of gears are provided between the inner and outer shafts, so that the rotation directions of the inner and outer shafts are opposite. The spokes 102 also include a power spoke and a connecting spoke. The outer shaft has at least one break, dividing the outer shaft into multiple segments, i.e., one break divides the outer shaft into two segments, and two breaks divide the outer shaft into three segments. The baffle plate 106 is only installed on the power spoke, and the power spoke is fixedly connected to the inner shaft through the break. The two ends of the connecting spoke are connected to the outer shaft and the cylindrical support net 103, so that the inner shaft rotates synchronously with the power spoke and the baffle plate 106. The outer shaft rotates synchronously with the connecting spokes and the cylindrical support net 103, and the two sets of synchronously rotating components rotate in opposite directions. During operation, the water flow pushes the baffle plate 106 to rotate along the water flow direction, which drives the inner shaft to rotate through the power spokes. The gear transmission drives the outer shaft to rotate in the opposite direction, and then drives the cylindrical support net 103 to rotate through the connecting spokes. At this time, the rotation direction of the lower end of the cylindrical support net 103 is opposite to the water flow direction. At this time, the dirt blocked and collected by the cylindrical support net 103 will directly leave the water surface and be directly cleaned by the scraper 201 and the groove 202 after exiting the water, and fall into the dirt collection tank 3 for collection. This method greatly reduces the probability of dirt falling and improves the dirt cleaning effect.

[0059] Example 3

[0060] Based on any of the above embodiments, such as Figures 1-4 As shown, the sludge collection tank 3 has a drain outlet 301 at one end, and a screw conveyor 302 is provided at the bottom of the sludge collection tank 3. The rotating shaft of the screw conveyor 302 is connected to the main shaft 101 for transmission.

[0061] The sludge collection trough 3 is a groove structure with an open top and closed ends. The trough walls are inclined and the cross-section is V-shaped to facilitate the collection of sludge. The screw conveyor 302 is set along the axis of the sludge collection trough 3 and installed at the bottom of the V-shaped structure, with the transmission direction facing the drain outlet 301.

[0062] In a more preferred embodiment, a guide plate 303 is provided above the sludge collection tank 3, and the guide plate 303 is located below the cleaning scraper device 2.

[0063] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0064] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A rotating self-cleaning trash rack suitable for hydropower stations, characterized in that, It includes a rotating grid assembly (1) mounted on both sides of the water inlet channel and a self-cleaning component installed on the rotating grid assembly (1). The self-cleaning component includes a cleaning scraper (2) attached to the rotating grid assembly (1) and a sludge collection tank (3) installed below the cleaning scraper (2).

2. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 1, characterized in that, The rotating grid assembly (1) includes a main shaft (101), several spokes (102) and a cylindrical support net (103). The spokes (102) connect the main shaft (101) and the cylindrical support net (103). The two ends of the main shaft (101) are respectively mounted on the support members (104) on both sides of the water inlet channel.

3. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 2, characterized in that, The rotating grid assembly (1) also includes several trash racks (105) uniformly installed on the outer periphery of the cylindrical support net (103).

4. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 3, characterized in that, The cleaning scraper device (2) includes several scrapers (201) that are close to the cylindrical support net (103). A scraper groove (202) is provided between two adjacent scrapers (201). The scraper groove (202) is located on the moving path of the trash rack (105). The width of the scraper groove (202) is equal to the thickness of the trash rack (105).

5. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 2, characterized in that, The cleaning and scraping device (2) also includes a high-pressure flushing device (203) installed above the cylindrical support net (103). The high-pressure flushing device (203) includes a plurality of nozzles (204) facing the cylindrical support net (103), and the nozzles (204) are all connected to the high-pressure water pump through pipelines.

6. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 5, characterized in that, Several of the nozzles (204) are evenly distributed along the axis of the cylindrical support net (103).

7. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 2, characterized in that, The sidewall of the spoke (102) is provided with a barrier plate (106) for contacting the water flow, and the barrier plate (106) is perpendicular to the direction of the water flow.

8. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 7, characterized in that, The barrier plate (106) corresponds one-to-one with the spoke plate (102).

9. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 2, characterized in that, The sludge collection tank (3) has a drain outlet (301) at one end, and a screw conveyor (302) is provided at the bottom of the sludge collection tank (3). The shaft of the screw conveyor (302) is connected to the main shaft (101) for transmission.

10. A rotating self-cleaning trash rack suitable for hydropower stations according to claim 1, characterized in that, A guide plate (303) is provided above the sludge collection tank (3), and the guide plate (303) is located below the sludge cleaning scraper device (2).

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