Sand filtering pond water path system and sand filtering pond
By designing a U-shaped main pipeline and intersecting pipelines, the problem of pipeline blockage in the sand filter tank was solved, achieving a highly efficient sewage filtration effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-13
Smart Images
Figure CN223992050U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of filtration technology, and in particular to a water system for a sand filter tank and a sand filter tank. Background Technology
[0002] In the process of treating sewage, sand filters are used to filter particulate matter in the sewage so that it can be retained in the sand filters.
[0003] In existing technology, a pipe is installed at the bottom of the sand filter tank, and a filter media layer is installed at the top of the pipe. Multiple small holes are opened in the pipe. Wastewater to be treated is sprayed into the sand filter tank through the pipe and small holes and filtered by the filter media layer. The pipe in the existing technology is antenna-shaped. Specifically, the pipe includes a main pipe section and branch pipe sections connected to both sides of the main pipe section. Both the main pipe section and the branch pipe sections are straight. One end of the main pipe section is the inlet, and the other end is sealed. After entering through the main pipe section, the wastewater is diverted to multiple branch pipe sections and sprayed into the sand filter tank through the small holes on the main pipe section and branch pipe sections, where it is filtered. During the wastewater treatment process, there are usually intermittent periods. During these periods, stagnant wastewater remains in the main pipe section and branch pipe sections. Solids such as sludge in the wastewater will settle in the main pipe section and straight pipe sections. When the treatment process is restarted, the sludge and other solids clog the ends of the main pipe section and branch pipe sections, causing blockage and affecting the efficiency of wastewater treatment. Utility Model Content
[0004] The purpose of this invention is to provide a water system for a sand filter tank to solve the technical problem of easy pipe blockage and low filtration efficiency in the prior art.
[0005] The purpose of this invention is to provide a sand filter tank with a better filtration effect.
[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:
[0007] The water system of the sand filter tank includes:
[0008] The main road is shaped like a square and includes four main sections connected in sequence and corner sections connecting two adjacent main sections. At least two of the four corner sections are characteristic corner sections, and each characteristic corner section is provided with an entrance.
[0009] The intersecting pipeline includes a first branch pipe and a second branch pipe that are intersected and connected at the intersection. The two ends of the first branch pipe are connected to two main pipe sections opposite to each other in a first direction. The two ends of the second branch pipe are connected to two main pipe sections opposite to each other in a second direction. Both the first branch pipe and the second branch pipe are provided with a first through hole. The first direction is perpendicular to the second direction.
[0010] In one embodiment, two of the four corner segments are the characteristic corner segments, and the two characteristic corner segments are arranged opposite each other in the diagonal direction of the main road.
[0011] In one embodiment, the main pipeline is provided with a plurality of second through holes.
[0012] In one embodiment, the inlet is selectively provided with a blocking element;
[0013] Alternatively, the sand filter pool water system may further include at least two delivery branch pipes, each corresponding to one of the characteristic corner sections and connected to the corresponding characteristic corner section through the inlet; each delivery branch pipe is equipped with a control valve.
[0014] In one embodiment, the inner diameter of the main pipe section is greater than the inner diameter of the first branch pipe; and / or, the inner diameter of the first branch pipe is equal to the inner diameter of the second branch pipe.
[0015] In one embodiment, the first branch pipe, the second branch pipe, and the main pipeline are arranged on the same layer; and / or, the first branch pipe is perpendicular to the second branch pipe.
[0016] In one embodiment, the first branch pipe is connected to the center of the corresponding main pipe section along its length; the second branch pipe is connected to the center of the corresponding main pipe section along its length.
[0017] In one embodiment, the main pipeline is connected to a quick-connect fitting for connecting a backwashing device.
[0018] In one embodiment, the main pipeline is made of stainless steel; and / or, the cross pipeline is made of stainless steel.
[0019] A sand filter tank includes the sand filter tank water system as described above. The sand filter tank also includes a tank body and a filter media layer. The sand filter tank water system is located at the bottom of the tank body, and the filter media layer is located on the side of the sand filter tank water system facing away from the bottom of the tank.
[0020] The beneficial effects of this utility model are:
[0021] The sand filter tank water system provided by this utility model designs the main pipeline in a U-shape, with the inlet located at a key corner. This allows the main pipeline to include at least two inlets, through which wastewater to be treated can be introduced. The inlets can be switched, allowing the pipeline end to be moved closer to the other inlet. This enables the high-pressure fluid flowing in through the other inlet to move fixed impurities such as sludge at the pipeline end, achieving cleaning of these impurities and reducing water loss. This design reduces the risk of clogging the main pipeline with sludge and other fixed impurities, ensuring the efficiency and effectiveness of wastewater treatment. Furthermore, by setting up intersecting pipelines, with the first and second branches of the intersecting pipelines crossing each other, most of the wastewater flowing out of the first and second branches can be ejected from the first through holes on the first and second branches. Wastewater that does not eject through the first through holes can also flow into the main pipeline section without stagnating on the first and second branches, reducing the risk of clogging in the first and second branches. This ensures that the entire sand filter water system is relatively unobstructed, thereby guaranteeing the filtration effect and efficiency of the sand filter using the sand filter water system. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0023] Figure 1 This is a first structural schematic diagram of the sand filter pool water system provided in this embodiment of the utility model;
[0024] Figure 2 This is a schematic diagram of the second structure of the sand filter pool water system provided in this embodiment of the utility model;
[0025] Figure 3 This is a cross-sectional view of the sand filter tank provided in an embodiment of this utility model;
[0026] Figure 4 This is a schematic diagram of the wastewater filtration system provided in an embodiment of the present invention.
[0027] In the picture:
[0028] 100. Main pipeline; 110. Main pipeline section; 120. Turning section; 121. Characteristic turning section; 122. Inlet; 200. Crossing pipeline; 210. First branch pipe; 220. Second branch pipe; 300. Conveying branch pipe; 400. Control valve; 10. Tank body; 20. Filter media layer; 1. Sludge tank; 2. Intermediate water tank; 3. Secondary sedimentation tank; 4. Disinfection tank; 5. Sludge thickening tank. Detailed Implementation
[0029] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0030] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.
[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.
[0034] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for ease of description and simplification of operation. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.
[0035] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.
[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0037] This embodiment provides a sand filter tank water system that can prevent blockages and has high reliability.
[0038] like Figure 1 and Figure 2 As shown, the sand filter tank water system includes a main pipeline 100 and intersecting pipelines 200. The main pipeline 100 is U-shaped and includes four sequentially connected main pipeline sections 110 and corner sections 120 connecting adjacent main pipeline sections 110. That is, there are also four corner sections 120, and the four main pipeline sections 110 and four corner sections 120 are alternately connected in a loop. In some optional embodiments, the main pipeline sections 110 are straight pipes, and the corner sections 120 are right-angle elbows.
[0039] In this embodiment, at least two of the four corner segments 120 are characteristic corner segments 121. That is, the four corner segments 120 may include two characteristic corner segments 121, three characteristic corner segments 121, or all four corner segments 120 may be characteristic corner segments 121. Furthermore, each characteristic corner segment 121 is provided with an inlet 122, through which sewage to be treated can be introduced into the main pipeline 100.
[0040] In one embodiment, each feature corner segment 121 may have one entrance 122. In other embodiments, each feature corner segment 121 may have multiple entrances 122, which is not limited in this embodiment. The entrance 122 may be located at the top, bottom, or side of the corner segment 120, which is not limited in this embodiment.
[0041] like Figure 1 As shown, the cross-pipeline 200 includes a first branch pipe 210 and a second branch pipe 220 that are cross-connected and intersecting. The first branch pipe 210 and the second branch pipe 220 are connected at their intersection. The two ends of the first branch pipe 210 are connected to two main pipe sections 110 of the main pipeline 100 that are opposite each other in a first direction, and the two ends of the second branch pipe 220 are connected to two main pipe sections 110 of the main pipeline 100 that are opposite each other in a second direction. Both the first branch pipe 210 and the second branch pipe 220 are provided with a first through hole. This arrangement allows sewage in the main pipeline 100 to flow into the first branch pipe 210 and the second branch pipe 220, and to be ejected through the first through holes in the first branch pipe 210 and the second branch pipe 220. The first direction is perpendicular to the second direction.
[0042] The sand filter tank water system provided in this embodiment designs the main pipeline 100 in a U-shape, with the inlet 122 of the main pipeline 100 located at a characteristic corner section 121. This allows the main pipeline 100 to include at least two inlets 122, through which wastewater to be treated can be introduced into the main pipeline 100. This allows the inlets 122 of the main pipeline 100 to be switched, thereby changing the end of the pipeline 100 by changing the inlet 122. This ensures that the end of the pipeline corresponding to one inlet 122 is closer to the other inlet 122, allowing the high-pressure fluid flowing in through the other inlet 122 to move the sludge and other fixed impurities at the end of the pipeline, thus achieving the cleaning of the sludge and other fixed impurities at the end of the pipeline. This reduces the risk of clogging the main pipeline 100 by sludge and other fixed impurities, ensuring the efficiency and effectiveness of wastewater treatment. Furthermore, by setting up cross pipelines 200, with the first branch pipe 210 and the second branch pipe 220 of the cross pipelines 200 intersecting, most of the wastewater flowing out of the first branch pipe 210 and the second branch pipe 220 can be ejected from the first through holes on the first branch pipe 210 and the second branch pipe 220. Wastewater that does not eject through the first through holes can also flow into the main section 110 of the main pipeline 100, without stagnating on the first branch pipe 210 and the second branch pipe 220. This reduces the risk of clogging of the first branch pipe 210 and the second branch pipe 220, ensuring that the entire sand filter water system is relatively unobstructed, thereby guaranteeing the filtration effect and filtration efficiency of the sand filter using the sand filter water system.
[0043] In some alternative embodiments, such as Figure 2 As shown, two of the four corner sections 120 are characteristic corner sections 121, and these two characteristic corner sections 121 are arranged opposite each other in the diagonal direction of the main pipeline 100. With this arrangement, when sewage enters the sand filter tank water system through the inlet 122 on one of the characteristic corner sections 121, the other characteristic corner section 121 is the end of the main pipeline 100. During periods when sewage treatment is stopped, sludge will accumulate at this other characteristic corner section 121. When the sewage treatment process is restarted, the inlet 122 of this other characteristic corner section 121 is used as the sewage inlet 122. At this time, the pressurized sewage directly impacts the sludge deposited at this other characteristic corner section 121, thereby cleaning the sludge. The alternating use of the inlets 122 of the two characteristic sections 121 further reduces the risk of sludge blockage in the sand filter tank water system, resulting in a more flexible structure and higher reliability.
[0044] For example, Figure 2 The illustration shows two feature corner segments 121 as corner segments 120 at the top left and bottom right. In other embodiments, the two feature corner segments 121 can also be corner segments 120 at the bottom left and top right. This embodiment does not limit this.
[0045] It is understandable that all four corner segments 120 could be characteristic corner segments 121, but this embodiment does not limit this.
[0046] In one embodiment, only the first branch pipe 210 and the second branch pipe 220 are provided with first through holes, while the main pipe section 110 is not provided with through holes. In this embodiment, both the first branch pipe 210 and the second branch pipe 220 are provided with multiple first through holes to improve the uniformity of the sprayed wastewater.
[0047] In other embodiments, not only are the first branch pipe 210 and the second branch pipe 220 provided with first through holes, but each main pipe section 110 is also provided with a second through hole, so that sewage can also be sprayed out through the main pipe section 110. For example, each main pipe section 110 is provided with multiple second through holes to further improve the uniformity of the sprayed sewage.
[0048] It is understood that the diameter of the first through hole and the diameter of the second through hole can be the same or different, and this embodiment does not limit this. When the diameter of the first through hole and the diameter of the second through hole are different, the diameter of the first through hole can be larger or smaller than the diameter of the second through hole, and this embodiment does not limit this.
[0049] In this embodiment, the states of the multiple inlets 122 can be switched. That is, each inlet 122 has a conducting state and a blocked state. When the inlet 122 is in the conducting state, sewage can enter the main pipeline 100 through the inlet 122; when the inlet 122 is in the blocked state, sewage cannot enter the main pipeline 100 through the inlet 122.
[0050] In some alternative embodiments, each inlet 122 is selectively provided with a blocking element. When the inlet 122 is blocked by the blocking element, it is in a blocked state. The blocking element may also not block the inlet 122. The blocking element includes, but is not limited to, a blockage.
[0051] In other embodiments, the inlet 122 may not be fitted with a plug, or a plugging structure may be provided on the pipe connected to the inlet 122. For example, such as... Figure 2As shown, the sand filter tank water system also includes at least two conveying branch pipes 300. Each of the at least two conveying branch pipes 300 corresponds one-to-one with at least two characteristic bend sections 121 and is connected to the corresponding characteristic bend section 121 via an inlet 122. The conveying branch pipes 300 are used to convey sewage into the main pipeline 100. In this embodiment, a control valve 400 is provided on the conveying branch pipe 300. The control valve 400 can control the flow area of the corresponding conveying branch pipe 300 when it has different opening degrees. The control valve 400 includes, but is not limited to, flow valves, solenoid valves, etc. By setting the conveying branch pipes 300 and the control valve 400, the amount of sewage conveyed from the conveying branch pipe 300 to the inlet 122 connected to it can be controlled. When the opening degree of the control valve 400 is 0, the conveying branch pipe 300 containing the control valve 400 does not input sewage into the main pipeline 100 through its corresponding inlet 122. When the opening degree of control valve 400 is not 0, the conveying branch pipe 300 where control valve 400 is located inputs sewage into the main pipeline 100 through its corresponding inlet 122.
[0052] To ensure sufficient pressure for the sewage within the first branch pipe 210, in some optional embodiments, the inner diameter of the main pipe section 110 is larger than that of the first branch pipe 210. This reduces the flow area when the sewage in the main pipe section 110 flows into the first branch pipe 210, thereby increasing the pressure of the sewage within the first branch pipe 210 and facilitating its ejection through the first through hole. It is also understood that the inner diameter of the main pipe section 110 is larger than that of the second branch pipe 220, ensuring that the sewage in the second branch pipe 220 also has sufficient pressure to eject. Optionally, the inner diameters of the multiple main pipe sections 110 are identical.
[0053] In one possible implementation, the inner diameter of the first branch pipe 210 is equal to the inner diameter of the second branch pipe 220, so as to ensure that the pressure in the first branch pipe 210 and the second branch pipe 220 is more balanced, thereby improving the uniformity of the sewage sprayed into the sand filter tank from the first branch pipe 210 and the second branch pipe 220 and improving the sewage filtration effect.
[0054] In some alternative embodiments, such as Figure 1 and Figure 2 As shown, one cross pipe 200 is provided, that is, one first branch pipe 210 and one second branch pipe 220 are provided. In other embodiments, multiple cross pipes 200 may be provided, with the first branch pipes 210 of the multiple cross pipes 200 spaced apart, the second branch pipes 220 of the multiple cross pipes 200 spaced apart, and the multiple first branch pipes 210 and the multiple second branch pipes 220 interconnected to form a grid. With this configuration, the water system of the sand filter tank is arranged in a grid pattern at the bottom of the sand filter tank, which improves the uniformity of the distribution of sewage sprayed from the bottom of the sand filter tank, thereby improving the sand filtration efficiency and sand filtration effect.
[0055] In this embodiment, the first branch pipe 210, the second branch pipe 220 and the main pipeline 100 are arranged on the same layer. That is, the first branch pipe 210, the second branch pipe 220 and the main pipeline 100 are located in the same plane. Such an arrangement can reduce the pressure loss when sewage flows in the water path system of the sand filtration tank, ensuring that the sewage has sufficient pressure to eject.
[0056] Exemplarily, as Figure 1 shown, the first branch pipe 210 is perpendicular to the second branch pipe 220. In this way, it is convenient for the connection and assembly of the first branch pipe 210 and the second branch pipe 220, and also enables the connection position of the first branch pipe 210 and the second branch pipe 220 to be closer to the center position of the water path system of the sand filtration tank, improving the uniformity of the distribution of the first branch pipe 210 and the second branch pipe 220 in the entire water path system of the sand filtration tank, and further improving the uniformity of the distribution of the sludge ejected through the first through hole.
[0057] In some optional embodiments, the first branch pipe 210 is connected to the center of the corresponding main pipe section 110 in the length direction, and the second branch pipe 220 is connected to the center of the corresponding main pipe section 110 in the length direction. That is, the overall water path system of the sand filtration tank is in a "field" shape. Such an arrangement makes the first branch pipe 210 and the second branch pipe 220 more centered in the length direction and width direction of the main pipeline 100, further improving the uniformity of the sewage ejected through the first through hole, enabling each area of the sand filtration tank to have the sewage to be filtered, and avoiding the problem of heavy local filtration tasks.
[0058] Optionally, the main pipeline 100 of this embodiment can also be connected with a quick connector, where the quick connector is used to connect the backwashing device. When the blocked sludge in the water path system of the sand filtration tank is too thick or adhered to the inner wall of the pipeline, it may be impossible to clean the sludge relying on the impact of the sewage. At this time, the backwashing device can be used for flushing. The backwashing device has high-pressure fluid (such as water). After being introduced into the main pipeline 100, the high-pressure fluid can flush the sludge to achieve the cleaning of the main pipeline 100. It should be noted that the pressure of the fluid in the backwashing device will be greater than the pressure of the sludge. By setting the quick connector, the quick connection between the main pipeline 100 and the backwashing device can be achieved, reducing the connection difficulty between the two and improving the connection effect.
[0059] To extend the service life of the main pipeline 100, optionally, the material of the main pipeline 100 is stainless steel, so that the main pipeline 100 can meet the requirements of long-term stable use. For example, the material of the main pipeline 100 is 304 stainless steel.
[0060] Similarly, the material of the cross pipeline 200 is stainless steel, so that the cross pipeline 200 has a long service life and high stability. For example, the material of the cross pipeline 200 is 304 stainless steel.
[0061] In some alternative embodiments, the main pipeline 100 and / or the cross pipeline 200 may also be equipped with maintenance branch ports (not shown in the figure), which are installed on the maintenance platform for daily pressure testing, and the drainage pressure is used to corroborate the degree of sludge blockage.
[0062] On the other hand, this embodiment also provides a sand filter tank with good filtration effect.
[0063] like Figure 3 As shown, the sand filter tank includes a tank body 10, a filter media layer 20, and a water system as described above. The water system is located at the bottom of the tank body 10, and the filter media layer 20 is located on the side of the water system facing away from the bottom; that is, the water system is situated between the bottom of the tank body 10 and the filter media layer 20. The filter media in the filter media layer 20 is capable of filtering wastewater.
[0064] In some optional embodiments, multiple layers of gravel (not shown in the figure) are laid below the filter media layer 20, with the particle size gradually decreasing from bottom to top to ensure uniform flow of wastewater. The tank body 10 is also equipped with a collection tank or collection pipe, through which the filtered wastewater is collected and discharged.
[0065] The sand filter tank provided in this embodiment is designed with dual-loop alternating water supply, so that the water pressure of the pump body used to drive the sewage flow forms an alternating thrust in the main pipeline 100, without dead bends, which facilitates the emptying of sludge in the main pipeline 100 and the intersecting pipelines 200.
[0066] Alternatively, sand filter tanks can be used in sludge treatment systems, in which case, such as Figure 4 As shown, the sludge treatment system may also include a sludge tank 1, an intermediate water tank 2, a secondary sedimentation tank 3, a disinfection tank 4, a sludge thickening tank 5, etc. In this embodiment, the main pipeline 100 is connected to the intermediate water tank 2 through a conveying branch pipe 300.
[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.
Claims
1. A sand filter pond waterway system characterized by, The application relates to a sand filter water channel system. The main pipeline (100) is in a mouth-shaped form and comprises four main pipeline sections (110) and corner sections (120) connected between adjacent two main pipeline sections (110) in sequence, at least two of the four corner sections (120) are characteristic corner sections (121), and the characteristic corner sections (121) are provided with inlets (122). The cross pipeline (200) comprises a first branch pipeline (210) and a second branch pipeline (220) cross arranged and communicated at a cross position, two ends of the first branch pipeline (210) are communicated with two main pipeline sections (110) corresponding to the first branch pipeline (210) in a first direction, two ends of the second branch pipeline (220) are communicated with two main pipeline sections (110) corresponding to the second branch pipeline (220) in a second direction, and first through holes are arranged on the first branch pipeline (210) and the second branch pipeline (220); wherein the first direction is perpendicular to the second direction.
2. The skimmer line system of claim 1, wherein, Two of the four corner sections (120) are the characteristic corner sections (121), and the two characteristic corner sections (121) are oppositely arranged in a diagonal direction of the main pipeline (100).
3. The skimmer line system of claim 1, wherein, The main pipeline (100) is provided with a plurality of second through holes.
4. A filter pond waterway system according to any one of claims 1-3, characterized in that The inlet (122) is selectively provided with a plugging piece. Alternatively, the sand filter water channel system further comprises at least two conveying branch pipelines (300) corresponding to the characteristic corner sections (121) one by one and communicated with the corresponding characteristic corner sections (121) through the inlets (122); and control valves (400) are arranged on the conveying branch pipelines (300).
5. A filter pond raceway system according to any one of claims 1-3, wherein, The inner diameter of the main pipeline section (110) is greater than the inner diameter of the first branch pipeline (210); and / or the inner diameter of the first branch pipeline (210) is equal to the inner diameter of the second branch pipeline (220).
6. A filter pond raceway system according to any one of claims 1-3, wherein, The first branch pipeline (210), the second branch pipeline (220) and the main pipeline (100) are arranged in the same layer; and / or the first branch pipeline (210) is perpendicular to the second branch pipeline (220).
7. A filter pond raceway system according to any one of claims 1-3, wherein, The first branch pipeline (210) is connected to the center of the corresponding main pipeline section (110) in the length direction; and the second branch pipeline (220) is connected to the center of the corresponding main pipeline section (110) in the length direction.
8. A filter pond raceway system according to any one of claims 1-3, wherein, The main pipeline (100) is connected with a quick connector used for connecting a backwashing device.
9. A filter pond raceway system according to any one of claims 1-3, wherein, The material of the main pipeline (100) is stainless steel; and / or the material of the cross pipeline (200) is stainless steel.
10. A sand filter, characterised in that The application further relates to a sand filter comprising a pool body (10) and a filter material layer (20), and the sand filter water channel system is arranged on the pool bottom of the pool body (10), and the filter material layer (20) is arranged on the side of the sand filter water channel system away from the pool bottom.