Drainage tank

Abstract

The embodiment of the utility model provides a drainage tank which comprises a tank body, a sand baffle, a grating and a floating block as shown in the figure-figure. The sand blocking plate protrudes relative to the plane where the bottom of the tank body is located, so that sand can be intercepted when water flows through the sand blocking plate; the floating block is installed in the containing bin, and when water exists in the containing bin, the floating block can float upwards to seal the sand discharging hole. When water in the containing bin is discharged, the floating block loses buoyancy to open the sand discharging hole. Therefore, after the filter tank disclosed by the utility model is used for backwashing, a large amount of flushed filter materials can be gathered on one side of the sand baffle and discharged from the sand discharging holes, so that the blockage of pipelines and water channels is avoided, and the loss of the filter materials is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of water treatment, and particularly relates to a drain trough. Background Art

[0002] Filtration refers to the process in which suspended particles in water are intercepted and separated by a medium or filter screen with voids, and is widely used in water supply treatment and sewage treatment.

[0003] During the filtration process, more and more suspended particles in water are intercepted in the filter layer. The porosity between the filter media gradually decreases, the water flow velocity through the gaps in the filter layer gradually increases, and at the same time, the flow pattern and resistance coefficient change, resulting in an increase in the filtration head loss. Due to the increase in the scouring shear force of the water flow in the filter layer, impurities are likely to penetrate the filter layer, and the filtered water quality deteriorates. In order to restore the filtration capacity of the filter layer and wash away the dirt intercepted in the filter layer, the filter tank needs to be flushed. High-speed water backwashing is a common flushing method for filter tanks. A high-speed water flow equivalent to more than 4 to 5 times the filtration rate flushes the filter layer from bottom to top. The filter media move upward due to the action of the bypass resistance force and are in an expanded state. The rising water flow continuously scours the filter media, causing them to collide and rub against each other, and the sludge attached to the surface of the filter media will fall off and be discharged out of the tank with the water flow.

[0004] The water used for backwashing is generally discharged through a backwashing drain trough provided above the filter tank. During the backwashing process, if the backwashing intensity is too small, the filter media will not be washed clean; but if the intensity is too large, a small amount of filter media will be washed out and discharged with the backwashing drainage weir, resulting in filter media loss, and in severe cases, even blocking pipelines and water channels. Utility Model Content

[0005] The technical problem to be solved by this utility model is: to provide a drain trough in order to solve the problems existing in the drain trough structure during backwashing in the prior art.

[0006] The technical solution adopted by this utility model to solve its technical problems is:

[0007] A drain trough, comprising:

[0008] A trough body, the inside of which can accommodate water or allow water flow to flow from its first end to its second end; at least one sand discharge hole is provided at the bottom of the trough body;

[0009] A sand retaining plate, located at the bottom of the trough body and on the side of the sand discharge hole close to the second end of the trough body; the sand retaining plate protrudes relative to the plane where the bottom of the trough body is located so as to be able to intercept sand and gravel when water flows through.

[0010] A grille, connected below the trough body and connected to the sand discharge hole; the grille has a receiving bin.

[0011] A floating block is installed in the accommodation bin. When there is water in the accommodation bin, the floating block can float up to seal the sand discharge hole; when the water in the accommodation bin is drained, the floating block loses buoyancy and opens the sand discharge hole.

[0012] Preferably, for the drainage trough of the present utility model, the accommodation bin is spherical, the floating block is spherical, and the inner diameter of the accommodation bin is larger than the outer diameter of the floating block.

[0013] Preferably, for the drainage trough of the present utility model, the longitudinal sectional shape of the sand baffle along the water flow direction in the trough body is triangular.

[0014] Preferably, for the drainage trough of the present utility model, the sand baffle extends in a direction perpendicular to the water flow direction in the trough body.

[0015] Preferably, for the drainage trough of the present utility model, the sand baffle is made of angle steel.

[0016] Preferably, for the drainage trough of the present utility model, the sand baffle extends along the edge of the sand discharge hole.

[0017] Preferably, for the drainage trough of the present utility model, the grille is connected to the trough body through a connecting short pipe. The upper port diameter of the connecting short pipe matches the diameter of the sand discharge hole, and the upper end contour of the connecting short pipe matches the contour of the floating block.

[0018] Preferably, for the drainage trough of the present utility model, both sides of the trough body are triangular weirs or rectangular weirs.

[0019] Preferably, for the drainage trough of the present utility model, the trough body is a U-shaped trough.

[0020] Preferably, for the drainage trough of the present utility model, the diameter of the sand discharge hole is smaller than the maximum width of the floating block.

[0021] The beneficial effects of the present utility model are as follows: The sand baffle of the present utility model protrudes relative to the plane where the bottom of the trough body is located, and can intercept sand and gravel when water flows through; the floating block is installed in the accommodation bin. When there is water in the accommodation bin, the floating block can float up to seal the sand discharge hole; when the water in the accommodation bin is drained, the floating block loses buoyancy and opens the sand discharge hole. Therefore, after the filter tank adopting the present utility model starts backwashing, the flushed filter media can be largely gathered on one side of the sand baffle and discharged from the sand discharge hole, avoiding blockage of pipelines and water channels and reducing filter media loss. Description of the Drawings

[0022] The technical solutions of the present application will be further described below with reference to the drawings and embodiments.

[0023] Figure 1 It is a schematic top view of the drainage trough structure of the embodiment of the present application;

[0024] Figure 2 It isFigure 1 A-A cross-sectional view;

[0025] Figure 3 It is a schematic diagram of the in-progress state of the backwashing of the drainage trough in the embodiment of the present application;

[0026] Figure 4 It is a schematic diagram of the in-progress state of the backwashing of the floating block in the embodiment of the present application;

[0027] Figure 5 It is a schematic diagram of the end state of the backwashing of the drainage trough in the embodiment of the present application;

[0028] Figure 6 It is a schematic diagram of the end state of the backwashing of the floating block in the embodiment of the present application.

[0029] The reference numerals in the figure are:

[0030] 1. Tank body;

[0031] 2. Sand baffle;

[0032] 3. Grille;

[0033] 4. Connecting short pipe;

[0034] 5. Floating block;

[0035] 10. Sand discharge hole. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "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, and is only for the convenience of describing the present application 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 therefore should not be construed as limiting the protection scope of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0038] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0039] The technical solution of the present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] This embodiment provides a drainage trough, as Figures 1-2 shown, including: a trough body 1, a sand baffle 2, a grille 3, and a floating block 5.

[0041] The inside of the trough body 1 can accommodate water or allow water flow to flow from its first end to its second end; at least one sand discharge hole 10 is provided at the bottom of the trough body 1; the sand baffle 2 is located at the bottom of the trough body 1 and on the side of the sand discharge hole 10 close to the second end of the trough body 1; the sand baffle 2 protrudes relative to the plane of the bottom of the trough body 1 so as to intercept sand and gravel when water flows through; the grille 3 is connected below the trough body 1 and is connected to the sand discharge hole 10; the grille 3 has a receiving bin; the floating block 5 is installed in the receiving bin, and when there is water in the receiving bin, the floating block 5 can float up to close the sand discharge hole 10; when the water in the receiving bin is discharged, the floating block 5 loses buoyancy and opens the sand discharge hole 10.

[0042] In this embodiment, the sand baffle 2 is a plate body, and its function is to block sand and gravel by its own protrusion. The grille 3 is a reticular member with a hollow, and its function is to accommodate the floating block 5 while allowing sand and gravel to leak through its hollow. The floating block 5 is a block with a density less than that of water, and it moves up when buoyancy exists and down when buoyancy disappears.

[0043] The sand baffle 2 of the present utility model protrudes relative to the plane of the bottom of the trough body 1, which can intercept sand and gravel when water flows through; the floating block 5 is installed in the receiving bin, and when there is water in the receiving bin, the floating block 5 can float up to close the sand discharge hole 10; when the water in the receiving bin is discharged, the floating block 5 loses buoyancy and opens the sand discharge hole 10. Therefore, when the filter tank adopting the present utility model starts backwashing, the filter material expands, and the sludge intercepted in the filter material is washed into the water and quickly overflows into the trough body 1. A small amount of filter material will also be carried out and flow into the trough body 1. When the water flow with mud and sand flows through the sand baffle 2, due to the blocking effect of the sand baffle 2, since sand is much heavier than water and mud, water and mud are more likely to cross the sand baffle 2, as Figure 3 、 Figure 4As shown, the sand is intercepted in front of the sand retaining plate 2 and gradually accumulates around the sand discharge hole 10. After backwashing is completed, it is necessary to discharge the dirty water in the upper part of the filter tank, such as Figure 5 、 Figure 6 As shown, after the floating block 5 loses buoyancy, it drops and opens the sand discharge hole 10, and the intercepted filter media then falls through the sand discharge hole 10. Since the grille 3 is hollow, the filter media falls into the filter tank from the hollow parts on the grille 3.

[0044] Therefore, after the filter tank adopting the present utility model starts backwashing, the flushed filter media can accumulate in large quantities on one side of the sand retaining plate 2 and be discharged from the sand discharge hole 10, avoiding blockage of pipelines and water channels. The discharged filter media is easy to recycle, reducing filter media loss.

[0045] In addition, when the filter tank adopting the present utility model filters sewage, the floating block 5 is also in a floating state, and the sand discharge hole 10 is in a normally closed state, which does not affect normal filtration.

[0046] In an optional embodiment, as Figure 4 、 Figure 6 shown, the accommodating chamber is spherical, the floating block 5 is spherical, and the inner diameter of the accommodating chamber is larger than the outer diameter of the floating block 5. In this embodiment, the spherical structure makes the outer wall of the floating block 5 easier to roll along the inner wall of the accommodating chamber, and thus it is easier to close the sand discharge hole 10, avoiding the generation of gaps between the floating block 5 and the edge of the sand discharge hole 10.

[0047] In an optional embodiment, as Figure 4 、 Figure 6 shown, the longitudinal cross-sectional shape of the sand retaining plate 2 along the water flow direction in the tank body 1 is triangular. In this embodiment, the triangular structure is likely to produce a protruding tip, which is suitable as a structure for intercepting sand and gravel, and the triangular structure also has a plane, which is suitable for fitting with the bottom of the tank body 1 for easy installation.

[0048] In an optional embodiment, as Figure 1 shown, the sand retaining plate 2 extends in a direction perpendicular to the water flow direction in the tank body 1. Under this structure, both the center and the edge of the water flow can be fully blocked, avoiding partial loss of the filter media.

[0049] In an optional embodiment, the sand retaining plate 2 is made of angle steel. Using angle steel as the sand retaining plate 2 can meet the structural requirements and has a low procurement cost, which is beneficial to industrialization.

[0050] In an optional embodiment, the sand retaining plate 2 extends along the edge of the sand discharge hole 10. In this embodiment, the sand retaining plate 2 is semi-circular and is arranged along the edge of the sand discharge hole 10, making the intercepted sand and gravel closer to the sand discharge hole 10 and facilitating the accurate accumulation of sand and gravel.

[0051] In an optional embodiment, as Figures 4-6As shown, the grille 3 is connected to the tank body 1 through a connecting short pipe 4. The upper port diameter of the connecting short pipe 4 matches the diameter of the sand discharge hole 10, and the upper end contour of the connecting short pipe 4 matches the contour of the floating block 5. This structure can facilitate the fixation of the grille 3 and enable the floating block 5 to fully seal the connecting short pipe 4, which is equivalent to sealing the sand discharge hole 10.

[0052] In an alternative embodiment, as Figure 1 shown, the tank body 1 is a U-shaped groove, and both sides of the tank body 1 are triangular weirs to ensure uniform horizontal drainage. Similarly, in other embodiments, both sides of the tank body 1 can also be rectangular weirs.

[0053] In an alternative embodiment, as Figure 4 、 Figure 6 shown, the diameter of the sand discharge hole 10 is smaller than the maximum width of the floating block 5. This prevents the floating block 5 from exposing too much of the bottom of the tank body 1 when it floats, which affects the water flow, and also avoids occupying the stacking space of the intercepted filter media.

[0054] In an alternative embodiment, as Figure 1 、 Figure 2 shown, the sand retaining plate 2 and the sand discharge hole 10 are located at the position of the tank body 1 close to the second end, and the second end is the water outlet end of the tank body 1. Therefore, more sand and gravel can be intercepted by the sand retaining plate 2.

[0055] Taking the above ideal embodiments based on the present application as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this application. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A drainage trough, characterized in that: include: A trough body (1), the interior of the trough body (1) being capable of containing water or allowing water to flow from a first end thereof to a second end thereof; the bottom of the trough body (1) being provided with at least one sand discharge hole (10); A sand retaining plate (2) is located at the bottom of the trough body (1) and at a side of the sand discharge hole (10) close to the second end of the trough body (1); the sand retaining plate (2) is raised relative to the plane where the bottom of the trough body (1) is located so as to intercept sand and gravel when water flows through; A grille (3) is connected to the bottom of the tank body (1) and is connected to the sand discharge hole (10); the grille (3) has a storage bin; A floating block (5) is installed in the containing chamber. When water exists in the containing chamber, the floating block (5) can float up to close the sand discharge hole (10); when the water in the containing chamber is discharged, the floating block (5) loses buoyancy and opens the sand discharge hole (10).

2. The drainage trough according to claim 1, characterized in that: The containing chamber is spherical, the floating block (5) is spherical, and the inner diameter of the containing chamber is greater than the outer diameter of the floating block (5).

3. The drainage trough according to claim 1, characterized in that: The longitudinal cross-section of the sand retaining plate (2) along the flow direction of water in the trough body (1) is in the shape of a triangle.

4. The drainage trough according to claim 3, characterized in that: The sand retaining plate (2) extends in a direction perpendicular to the flow direction of water in the tank body (1).

5. The drainage trough according to claim 4, characterized in that: The sand retaining plate (2) is made of angle steel.

6. The drainage trough according to claim 3, characterized in that: The sand retaining plate (2) extends along the edge of the sand discharge hole (10).

7. The drainage trough according to any one of claims 1 to 6, characterized in that: The grid (3) is connected to the tank body (1) via a connecting short tube (4); the upper end diameter of the connecting short tube (4) matches the diameter of the sand discharge hole (10); and the upper end profile of the connecting short tube (4) matches the profile of the floating block (5).

8. The drainage trough according to any one of claims 1 to 6, characterized in that: Both sides of the trough body (1) are triangular weirs or rectangular weirs.

9. The drainage trough according to any one of claims 1 to 6, characterized in that: The trough body (1) is a U-shaped trough.

10. The drainage trough according to any one of claims 1 to 6, characterized in that: The diameter of the sand discharge hole (10) is smaller than the maximum width of the floating block (5).

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