Fixed type trash holding cover for vertical shaft type diversion channel

Abstract

The utility model discloses a fixed trash holding cover for a vertical shaft type water diversion channel, which belongs to the field of trash cleaning in water conservancy and hydropower engineering, and comprises a fixed trash holding cover arranged above the vertical shaft type water diversion channel, the section type of the trash holding cover is consistent with that of the vertical shaft type water diversion channel, and the trash holding cover adopts a big-end-up shaft type grating structure. A transition section between the upper grating structure and the lower grating structure can be of an inclined grating structure or a broken line type grating structure, and the cross section difference of the upper grating structure and the lower grating structure is not smaller than the cross section area of the vertical shaft type diversion channel. The top cover structure of the trash holding cover is of a non-overflowing solid structure, the upper surface of the top cover is of a conical surface structure, and the lower surface of the top cover is of a streamline structure. The problem that in water conservancy and hydropower engineering, dirt and sundries in a dirt blocking cover above a vertical shaft type water diversion channel are inconvenient to clean is solved, the dirt and sundries are automatically separated from the dirt blocking cover under the action of gravity load and hydraulic fluctuation, the dirt and sundries cleaning workload can be reduced, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of debris cleaning in water conservancy and hydropower projects, and particularly relates to a fixed trash rack with a self-cleaning function for a shaft-type water intake channel in a water conservancy and hydropower project. Background Technique

[0002] The shaft-type water intake channel is a common water intake structure in water conservancy and hydropower projects, usually arranged in the upstream reservoir area. The top elevation of the water intake channel is generally below the dead water level of the reservoir area. To prevent debris in the reservoir area from flowing downstream through the shaft-type water intake channel, a trash rack needs to be set above the shaft. The trash rack generally adopts a fixed planar steel grating structure, and the steel grating structure horizontally or obliquely covers the top of the shaft-type water intake channel.

[0003] Figure 1 、 Figure 2 It is a schematic elevation and sectional view of a conventional trash rack, where Figure 1 the trash rack 3 is horizontally arranged, Figure 2 the trash rack 3 is obliquely arranged. The trash rack covers above the shaft-type water intake channel 1. When the project diverts water, the trash rack can intercept debris 2 in the reservoir area, etc., and the debris 2 is likely to accumulate above the trash rack. During the water diversion period, the debris 2 in the reservoir area will gather above the shaft-type water intake channel 1 with the water flow and be isolated above the trash rack 3. When there is a large amount of debris in the reservoir area, the debris covering the trash rack will affect the water diversion flow rate, and may seriously affect the normal operation of the project in severe cases. Therefore, the trash rack needs to be cleaned regularly. Since the top elevation position of the shaft-type water intake channel is relatively low and is often below the water surface, generally, the debris 2 needs to be cleaned manually or by professional mechanical equipment. Therefore, it is difficult to clean the debris above the trash rack, and the cleaning work is laborious and time-consuming, with low efficiency. Content of the Utility Model

[0004] Aiming at the problems existing in the prior art, the utility model provides a fixed trash rack for a shaft-type water intake channel, which has a self-cleaning function. During the non-water diversion period, by using its own weight and the action of hydraulic fluctuations, the debris outside the trash rack can be automatically separated from the trash rack, reducing manual labor and improving the efficiency of debris cleaning.

[0005] The utility model is realized as follows. A fixed trash rack for a shaft-type water intake channel, the trash rack adopts a shaft-type grating structure with a large upper part and a small lower part. The upper cross-section of the grating structure is large, and the lower cross-section of the grating structure is small. The cross-section type of the trash rack is the same as that of the shaft-type water intake channel, and a top cover structure is arranged above the trash rack.

[0006] The grating structure adopts a streamline-type inclined grating structure.

[0007] The grating structure adopts a broken-line type grating structure.

[0008] The area difference between the upper cross-section and the lower cross-section of the grid structure is not less than the cross-sectional area of the shaft-type water intake channel.

[0009] The top cover structure of the trash rack adopts a non-flow-through solid structure. The upper surface of the top cover is a conical structure, and the lower surface is a streamlined structure protruding towards the shaft-type water intake channel. The protruding vertex of the streamlined structure is inserted into the trash rack.

[0010] The advantages and technical effects of the present utility model are as follows: It solves the problem that it is inconvenient to clean the dirt and sundries on the trash rack above the shaft-type water intake channel in water conservancy and hydropower projects. The dirt and sundries can automatically separate from the trash rack under the action of gravity load and hydraulic fluctuation, which can reduce the workload of cleaning dirt and sundries and improve the cleaning efficiency. Description of the Drawings

[0011] Figure 1 is a front elevation sectional view of the trash rack of the prior art;

[0012] Figure 2 is another front elevation sectional view of the trash rack of the prior art;

[0013] Figure 3 is a front elevation sectional view of the fixed trash rack for the shaft-type water intake channel of the present utility model with an inclined grid structure;

[0014] Figure 4 is a front elevation sectional view of the fixed trash rack for the shaft-type water intake channel of the present utility model with a broken-line transition grid structure;

[0015] Figure 5 is a schematic view of the upper cross-section of the fixed trash rack for the shaft-type water intake channel of the present utility model

[0016] Figure 6 is a schematic view of the lower cross-section of the fixed trash rack for the shaft-type water intake channel of the present utility model Detailed Description of the Preferred Embodiment

[0017] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] In the description of the creation of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the creation of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the creation of the present utility model.

[0019] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0020] Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the creation of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0021] In the description of the creation of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the creation of the present utility model can be understood through specific circumstances.

[0022] As Figure 3 , 4 shown, the fixed trash rack for the shaft-type water intake channel of the present utility model has a trash rack with an upper-large and lower-small shaft-type grille structure. The upper-large and lower-small shaft-type grille structure means that the cross-section of the upper part of the grille structure is large and the cross-section of the lower part of the grille structure is small. The cross-section type of the trash rack is the same as that of the shaft-type water intake channel, and a top cover structure is provided above the trash rack.

[0023] Specifically, the trash rack 4 is generally an upper-large and lower-small shaft-type steel grille structure, and the trash rack 4 is fixedly connected above the shaft-type water intake channel 1. The vertical shape of the trash rack 4 can either be an inclined grille structure as Figure 3 shown or a broken-line grille structure as Figure 4 shown. When diverting water, the trash rack 4 can intercept the sundries 2 in the reservoir area, and the illustrated sundries 2 are adsorbed around the trash rack 4. During the non-diversion period or the diversion interval period, when there is no water flow to the shaft-type water intake channel 1, under the influence of gravity and water flow fluctuations, the sundries 2 can automatically detach from the trash rack 4.

[0024] The horizontal cross-sectional shape of the trash rack 4 is consistent with the shape of the shaft-type water intake channel 1. The purpose of adopting the same cross-section is to cover the flow-through space above the shaft-type water intake channel 1 and effectively prevent the debris 2 from entering the shaft-type water intake channel 1. For example, when the cross-sectional shape of the shaft-type water intake channel 1 is circular, the horizontal cross-sectional shape of the self-cleaning trash rack 4 is also circular; when the cross-sectional shape of the shaft-type water intake channel 1 is octagonal, the horizontal cross-sectional shape of the self-cleaning trash rack 4 is also octagonal.

[0025] Figure 5 is a schematic diagram of the A--A cross-section of the upper part of the trash rack 4. The shaded part in the figure is the cross-sectional area of the upper part of the trash rack, assumed to be A1; Figure 6 is a schematic diagram of the B---B cross-section of the lower part of the trash rack 4. The shaded part in the figure is the cross-sectional area of the lower part of the trash rack, assumed to be A2. Assume that the flow-through area of the shaft-type water intake channel 1 is A0, and it is required that A2 - A1 ≥ A0. The purpose of doing this is to reserve a certain area difference during water diversion. Since the inclined section or the horizontal section of the trash rack 4 is less likely to be blocked, even if the debris 2 blocks the trash rack 4, it is relatively easy to break away during the non-water diversion period or the water diversion interval period.

[0026] To prevent the debris 2 from flowing through the top of the trash rack 4, the top cover 5 of the trash rack 4 is set as a non-flowing solid structure. The top surface of the top cover is set as a conical structure, so that the debris 2 is not easily accumulated on the top cover 5; the lower surface of the top cover structure of the trash rack is a streamlined structure protruding towards the shaft-type water intake channel, and the vertex of the protruding streamlined structure is inserted into the trash rack. The lower surface of the top cover is set as a streamlined structure, which can make the water flow smoothly in the flow channel and is not easy to generate a vacuum.

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixed trash rack for a shaft-type water intake channel, characterized in that, The trash rack adopts a well - type grille structure that is larger at the top and smaller at the bottom. The upper cross - section of the grille structure is large, and the lower cross - section of the grille structure is small. The cross - section type of the trash rack is consistent with that of the vertical intake channel, and a top cover structure is arranged above the trash rack.

2. The fixed trash rack for the shaft-type water intake channel according to claim 1, wherein The grille structure adopts an inclined grille structure.

3. The fixed trash rack for the shaft-type water intake channel according to claim 1, characterized in that The grille structure adopts a broken - line grille structure.

4. The fixed trash rack for the vertical intake channel according to any one of claims 1-3, characterized in that The area difference between the upper cross - section and the lower cross - section of the grille structure is not less than the cross - sectional area of the vertical intake channel.

5. The fixed trash rack for the shaft-type water intake channel according to claim 1, wherein The top cover structure of the trash rack adopts a non - flow - through solid structure. The upper surface of the top cover is a conical structure, and the lower surface is a streamlined structure protruding towards the vertical intake channel. The protruding vertex of the streamlined structure is inserted into the trash rack.

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