Water diversion device and water diversion system comprising same

Abstract

The utility model relates to a water diversion device and a water diversion system comprising the same, and belongs to the technical field of water environment treatment and drainage pipe networks. The device comprises a flow dividing chamber, a flow dividing water collecting chamber and an overflow water collecting chamber, and further comprises a flow dividing weir arranged between the flow dividing chamber and the flow dividing water collecting chamber and an overflow weir groove communicated with the flow dividing chamber and the overflow water collecting chamber, a water inlet main pipe is arranged on the flow dividing chamber, and water outlet pipes are arranged on the flow dividing water collecting chamber and the overflow water collecting chamber respectively. After water enters the water inlet main pipe, the water is shunted through the shunting water collecting chamber, and after the liquid level rises, the water is shunted through the shunting water collecting chamber and the overflow water collecting chamber. According to the system, a shunting water outlet pipe of a first-stage water shunting device is connected with a water inlet main pipe of a second-stage water shunting device in series, and shunting water shunted by the first-stage water shunting device is shunted again through the second-stage water shunting device, so that the shunting requirement when the water inlet amount is larger is met, and the problem that the shunting water amount is unstable can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water environment management and drainage pipe network, and relates to a water diversion device and a water diversion system comprising the device. Background Art

[0002] When the downstream sewage treatment plant is overloaded, sometimes a new sewage treatment plant will be built in the middle to treat part of the sewage in order to reduce the operating pressure of the downstream sewage treatment plant. At this time, it is necessary to divert part of the sewage from the sewage trunk pipe to the new sewage treatment plant. Ecological water replenishment is an important measure to implement the ecological environment restoration of rivers and lakes. Sometimes a new recycled water plant will be built near the river or lake, and part of the sewage will be diverted from the sewage trunk pipe to the new recycled water plant. After treatment by the recycled water plant, the recycled water will be replenished for the river and lake. The old city cannot implement a complete separation of rainwater and sewage. In order to control the pollution of combined rainwater and sewage, sewage is often diverted at the terminal of the combined canal, and new sewage treatment facilities are built on site. All sewage in the combined canal is treated in the dry season. The water volume in the combined canal increases dramatically in the rainy season. Due to the limited treatment capacity of the sewage treatment facilities, the diverted water volume needs to be strictly controlled to avoid the risk of overflow or flooding of the sewage treatment facilities.

[0003] All of the above situations involve sewage diversion, and all require a relatively stable diverted water volume. However, the water volume in the sewage trunk pipe or the combined rainwater and sewage canal is often variable, and when the water volume is large, it is usually much larger than the diverted water volume. The diverted water volume can be well controlled by using a water pump, but it consumes a lot of electricity. Mountainous cities have a large terrain difference, and the terrain height difference can often be used to achieve sewage self-flow without the need for a water pump to lift the sewage. At this time, how to control the diverted water volume is a relatively difficult task.

[0004] At present, the commonly used method is to connect the diversion pipe from the sewage main (or combined canal), install an online flow meter and an electric regulating valve (or gate) in the diversion pipe, adjust the opening degree of the electric regulating valve (or gate) according to the flow detected by the online flow meter, and use the PLC system for automatic control. In theory, this method can achieve good water volume control effect, but there are many problems in practical application. The flow of the sewage main (or combined canal) varies, and the electric regulating valve (or gate) is constantly adjusted. The motor of the valve is seriously heated and very easy to be damaged and replaced frequently; the coarse floating objects and suspended objects in the sewage are easy to block the valve; the valve and flow meter are easily damaged by water. Usually, it cannot be used after running for a period of time, and finally the opening degree of the valve (or gate) has to be manually adjusted. It is impossible to accurately control the flow, especially in the rainy season when the diverted sewage is seriously excessive, which brings huge operating pressure to the sewage treatment plant. At present, some equipment manufacturers also provide integrated diversion equipment, but their fundamental principles are consistent with the above method, so they cannot avoid the above problems.

[0005] In order to solve this prominent problem and ensure the normal operation of the sewage treatment plant, it is necessary to take an effective diversion measure. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a water diversion device and a water diversion system including the device to solve the problem of unstable diversion water volume caused by the unstable water volume in the sewage main pipe or the combined sewage and rainwater pipe.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] A water diversion device comprises a diversion chamber, a diversion water collecting chamber and an overflow water collecting chamber, wherein a diversion weir is arranged between the diversion chamber and the diversion water collecting chamber, the diversion chamber and the overflow water collecting chamber are connected through an overflow weir groove, and the overflow weir groove is arranged in the diversion chamber; a water inlet main pipe is arranged on the diversion chamber, a diversion water collecting chamber is arranged on the diversion water collecting chamber, and an overflow water collecting chamber is arranged on the overflow water collecting chamber; a wellbore is arranged on the top surface of the diversion chamber.

[0009] Optionally, the overflow weir trough includes a U-shaped trough formed by two vertically and oppositely arranged overflow weirs and a trough bottom, and the trough bottom is away from the bottom surface of the diversion chamber.

[0010] Optionally, the overflow weir is a rectangular thin-walled weir.

[0011] Optionally, the top surface elevation of the diversion weir is lower than the top surface elevation of the overflow weir trough.

[0012] Optionally, the bottom elevation of the diversion collection chamber is lower than the bottom elevation of the diversion chamber.

[0013] Optionally, the bottom elevation of the overflow water collection chamber is lower than the bottom elevation of the diversion chamber.

[0014] Optionally, a plurality of overflow weir grooves are arranged side by side, and intervals are provided between adjacent overflow weir grooves.

[0015] Optionally, the diverter weir is a rectangular thin-walled weir.

[0016] A water diversion system comprises at least two water diversion devices connected in series, wherein the two water diversion devices are a primary water diversion device and a secondary water diversion device arranged in sequence according to the water flow direction, and the diversion outlet pipe of the primary water diversion device is connected to the water inlet main pipe of the secondary water diversion device.

[0017] Optionally, the overflow outlet pipe of the primary water dividing device is arranged in parallel with the overflow outlet pipe of the secondary water dividing device.

[0018] The beneficial effects of the utility model are:

[0019] (1) The water diversion device of the utility model has a simple structure, no moving parts, is not easy to be blocked and fail, does not need to be equipped with electromechanical equipment, has no power consumption, has significant advantages such as low engineering investment and simple operation and maintenance, is suitable for sewage diversion needs in various scenarios, and plays a positive role in ensuring the normal operation of sewage treatment plants; it is especially suitable for the scenario of realizing sewage self-flow diversion under natural terrain conditions such as mountainous cities;

[0020] (2) This solution can also connect two-stage water diversion devices in series, and connect the diversion outlet pipe of the first-stage water diversion device to the water inlet main pipe of the second-stage water diversion device. This is convenient for use in situations where the designed water diversion device is too large to be implemented or the amount of water to be diverted is too large. Multi-stage diversion can be performed to reduce the size of the water diversion device and ensure smooth diversion outlet when the water inlet is large.

[0021] (3) The water diversion device of this scheme can utilize the hydraulic characteristics of the rectangular thin-wall weir. Through precise calculation, the size and height of the diversion weir and the overflow weir can be reasonably designed to adapt to the water volume that needs to be diverted and treated in various usage scenarios. It has a wide range of applications and can achieve effective control of the diverted water volume and overflow water volume.

[0022] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 It is an expanded axonometric diagram of the water diversion device of the utility model;

[0025] Figure 2 It is a plan view of the water diversion device in the utility model;

[0026] Figure 3 This is the AA cross-sectional view of the water diversion device of the utility model;

[0027] Figure 4 This is a BB cross-sectional view of the water diversion device of the utility model;

[0028] Figure 5 This is a CC cross-sectional view of the water diversion device of the utility model;

[0029] Figure 6 This is a schematic diagram of system flow diversion in Example 2 of the present utility model.

[0030] Reference numerals:

[0031] 1 water inlet main pipe, 2 diversion chamber, 3 diversion weir, 4 diversion water collecting chamber, 5 diversion outlet pipe, 6 overflow weir trough, 61 overflow weir, 7 overflow water collecting chamber, 8 overflow outlet pipe, 9 wellbore. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0033] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] See also Figure 1 to Figure 6, which is a water diversion device, including a diversion chamber 2, a diversion water collecting chamber 4 and an overflow water collecting chamber 7. A diversion weir 3 is arranged between the diversion chamber 2 and the diversion water collecting chamber 4, and the diversion chamber 2 and the overflow water collecting chamber 7 are connected through an overflow weir groove 6, and the overflow weir groove 6 is arranged in the diversion chamber 2; a water inlet main pipe 1 is arranged on the diversion chamber 2, a diversion water collecting chamber 4 is arranged with a diversion water collecting pipe 5, and an overflow water collecting chamber 7 is arranged with an overflow water collecting chamber 7. Two wells 9 are opened on the top surface of the diversion chamber 2, and the wells 9 connect the above-ground part with the diversion chamber 2, so as to facilitate entering the diversion chamber 2 from the ground for maintenance and construction.

[0036] The overflow weir trough 6 includes two relatively vertically arranged overflow weirs 61 and a U-shaped trough formed by a trough bottom, and the trough bottom is away from the bottom surface of the diversion chamber 2 so as to increase the water inflow into the diversion chamber 2.

[0037] The weir height of the diverter weir 3 is lower than the weir height of the overflow weir 61. When the amount of water entering the diverter chamber 2 is small, all of it is discharged through the diverter weir 3; when the amount of water entering the diverter chamber 2 is large and the liquid level of the diverter chamber 2 is higher than the weir height of the overflow weir 61, it is discharged through the diverter weir 3 and the overflow weir trough 6 respectively.

[0038] The bottom elevation of the diversion water collection chamber 4 and / or the overflow water collection chamber 7 is lower than the bottom elevation of the diversion chamber 2, which facilitates the flow of sewage from the diversion chamber 2 and can also provide more water collection chamber accommodating space.

[0039] A plurality of overflow weir grooves 6 are arranged side by side, and intervals are provided between adjacent overflow weir grooves 6; the number of overflow weir grooves 6 is calculated according to the amount of water inlet, and multiple overflow weir grooves 6 can improve the efficiency of diversion and overflow treatment; intervals are provided between adjacent overflow weir grooves 6 to facilitate the water in the diversion chamber 2 to flow into the overflow weir 61 from both sides of the overflow weir groove 6, thereby improving the treatment efficiency of the overflow weir 61.

[0040] like Figure 6 As shown, two or more water diversion devices can be connected in series to form a water diversion system. The diversion outlet pipe 5 of the primary water diversion device is connected to the water inlet trunk pipe 1 of the secondary water diversion device. The sewage flows out through the diversion outlet pipe 5 of the primary water diversion device and enters the water inlet trunk pipe 1 of the secondary water diversion device, and repeats the diversion and overflow again. The primary overflow outlet water and the secondary overflow outlet water are respectively connected to the downstream sewage trunk pipe, and the secondary diversion outlet water is connected to the sewage treatment plant. The multi-stage series diversion method can reduce the design size of the water diversion device, and can meet the large flow rate of sewage treatment and achieve higher flow control requirements. In addition, the overflow outlet pipe 8 of the primary water diversion device and the overflow outlet pipe 8 of the secondary water diversion device can be arranged in parallel, or they can be discharged to the downstream sewage trunk pipe respectively.

[0041] The diversion weir 3 and / or overflow weir 61 are rectangular thin-walled weirs. According to the hydraulic calculation formula of rectangular thin-walled weir: (where Q is the flow volume; b is the weir length; h is the water head on the weir; m0 is the flow coefficient, which is taken as 0.45; g is the acceleration of gravity, which is taken as 9.81). It can be seen that there is a clear relationship between the flow volume Q, the weir length b, and the water head h on the weir of the thin-walled weir: when the weir length increases, the flow volume will also increase accordingly; similarly, when the water head on the weir increases, the flow volume will also increase. The above hydraulic formula can also be simplified to: Q = 1.99bh 3 / 2 .

[0042] The operation process of the water diversion device of the utility model is as follows: sewage enters the diversion chamber 2 through the water inlet main pipe 1. When the water volume of the water inlet main pipe 1 does not exceed the designed average diversion sewage volume, all the sewage falls freely through the diversion weir 3 to the diversion water collection chamber 4, and then enters the sewage treatment plant through the diversion outlet pipe 5 for treatment; when the amount of sewage in the water inlet main pipe 1 gradually increases, the liquid level in the diversion chamber 2 gradually exceeds the weir height of the overflow weir 61. When the liquid level reaches the highest, the water flow diverted through the diversion weir 3 reaches the highest diversion flow Q max (i.e. the maximum inflow flow rate allowed by the sewage treatment plant), the maximum branch flow rate Q max and the average diverted sewage volume Q avg The functional relationship between them is: Q max =K Z ×Q avg , where K Z is the designed coefficient of variation, and the remaining sewage enters the overflow water collecting chamber 7 through the overflow weir 61, and then is connected to the downstream sewage main pipe through the overflow outlet pipe 8.

[0043] In order to design the aforementioned water diversion device, the required parameters include: the water flow Q of the water inlet main pipe 1 i , the liquid level height of diverter chamber 2 is H, the highest liquid level of diverter chamber 2 is H3, the height of diverter weir 3 is H1, the length of diverter weir 3 is b1, and the water head on diverter weir 3 is h 1avg , the highest water head on diversion weir 3 h 1max , overflow weir 61 height H2, overflow weir 61 length b2, overflow weir 61 head h 2avg , diverted water volume Q1, overflow water volume Q2, average diverted sewage volume Q avg , the highest fractional flow Q max , the maximum water inlet volume Q of the water inlet main pipe 1 imax .

[0044] The head above the weir is the height difference between the liquid surface and the top of the weir.

[0045] The design method of the water diversion device includes the following steps:

[0046] S1, when the liquid level H in the diversion chamber 2 is equal to the height H2 of the overflow weir 61, calculate the water head h on the diversion weir 31avg , obtain the diversion liquid level H and the weir height H2 of the overflow weir 61;

[0047] In step S1, when the water flow Q of the water inlet main pipe 1 is i Just equal to the designed average diversion sewage volume Q avg When the liquid level H in the diversion chamber 2 is equal to the height H2 of the overflow weir 61, the water volume Q of the water inlet main pipe 1 is i All the water is discharged after being diverted by the diverter weir 3. At this time, the water volume of the water inlet main pipe 1 is Q i =Equal to the diverted water volume Q1 of the diverter weir 3. Determine the weir length b1 and weir height H1 of the diverter weir 3 according to the pipe diameter parameters, and then according to the inflow water volume Q i , calculate the water head h on the diversion weir 3 1avg , thus obtaining the diversion liquid level H, that is, the overflow weir 61 weir height H2, the calculation formula is as follows:

[0048]

[0049] H=H2=H1+h 1avg (2).

[0050] S2, when the liquid level H in the diversion chamber 2 gradually exceeds the height H2 of the overflow weir 61 and reaches the highest liquid level H3 in the diversion chamber 2, calculate the overflow water volume Q2 of the overflow weir 61 and the water head h on the overflow weir 61 2avg , thereby obtaining the total weir length b2 of the overflow weir 61;

[0051] In step S2, when the water flow Q of the water inlet main pipe 1 is i Exceeding the designed average diversion sewage volume Q avg , and reach the maximum water inlet volume Q of the water inlet main pipe 1 imax When the liquid level H in the diverter chamber 2 is equal to the highest liquid level H3 in the diverter chamber 2, the diverter flow Q1 passing through the diverter weir 3 at this liquid level is just equal to the highest diverter flow Q max (i.e. the maximum water inflow allowed by the sewage treatment plant), at this time, the remaining water overflows through the overflow weir 61, and the overflow water volume Q2 of the overflow weir 61 can be obtained; according to the weir length b1 and the diversion flow Q1 (i.e. the maximum diversion flow Q max ) Calculate the water head h above the diversion weir 3 at this time 1max , thus obtaining the maximum liquid level H3 of the diversion chamber 2 and the water head h on the overflow weir 61 2avg , from Q2 and h 2avg The total weir length b2 of the overflow weir 61 can be obtained, and the calculation formula is as follows:

[0052] Q2=Q i -Q1 (3);

[0053]

[0054] H3=H1+h 1max (5);

[0055] h 2avg =H3-H2 (6);

[0056]

[0057] S3, determine the length L1 of the diverter chamber 2, the number n of the overflow weirs 61, the width L2 of the diverter chamber 4 and the overflow chamber 7, and the total width B of the diverter chamber 2.

[0058] In order to reduce the overall length of the water diversion device, the length L1 of the diversion chamber 2 and the number n of the overflow weirs 61 are determined according to the calculated total weir length b2 of the overflow weir 61 and the actual on-site needs (such as site restrictions, etc.), and there is a functional relationship between the three: b2=L1×n; then the widths of the diversion water collection chamber 4 and the overflow water collection chamber 7 are determined according to the diameters of the diversion outlet pipe 5 and the overflow outlet pipe 8 respectively; the total width B of the diversion chamber 2 is determined according to the diameter of the water inlet main pipe 1, the width and number of the overflow weir grooves 6 and the length of the diversion weir 3.

[0059] The water diversion device of the utility model can be used independently or in two-stage series. When the two-stage series is used, the first scheme is that both stages of diversion adopt the device, and the function of the second stage of diversion is to further control the diversion water volume, so that the final diversion water volume is closer to the designed average diversion sewage volume Q avg . The second solution is to use this device as the first-stage diversion, and the second-stage diversion uses electric valves and flow meters to further regulate the flow. Since the floating range of the effluent flow rate has been greatly reduced after the first-stage diversion, the regulating pressure of the electric valve and flow meter has been significantly reduced during the second-stage diversion, and the service life is naturally significantly extended. In short, the first-stage diversion achieves coarse division, and the second-stage diversion achieves fine division. The two-stage series diversion can achieve a more efficient and stable diversion effect on combined sewage, which not only meets the strict requirements of the sewage treatment plant on the water inlet volume, but also avoids the problems of easy damage and blockage of traditional diversion facilities.

[0060] In summary, the utility model utilizes the hydraulic characteristics of the rectangular thin-walled weir, and through precise calculation, reasonably designs the size and height of the diversion weir 3 and the overflow weir 61, so as to achieve effective control of the diverted water volume. The utility model provides a simple and efficient water diversion device, which is suitable for sewage diversion needs in various scenarios, especially for the scene of realizing sewage self-flow diversion under natural terrain conditions such as mountainous cities. It has the significant advantages of simple structure, no moving parts, not easy to block and fail, no need to configure electromechanical equipment, no power consumption, low engineering investment, simple operation and maintenance, etc. It can ensure the normal operation of the sewage treatment plant, and has positive significance for improving sewage treatment efficiency and reducing environmental pollution.

[0061] Example 1

[0062] A new reclaimed water plant is being built for a river replenishment project. It is necessary to divert sewage from a sewage trunk pipe for sewage regeneration and then replenish the river. The average water treatment volume of the designed reclaimed water plant is Q avg =1250m 3 / h, design variation coefficient K Z =1.7, then Q max =K Z ×Q avg -2125m 3 / h. It is known that the diameter of the water inlet main pipe 1 is DN1000mm, and the maximum water inlet volume of the water inlet main pipe 1 is Q imax =8300m 3 / h.

[0063] The design adopts this water diversion device to divert sewage. The design diversion pipe diameter is DN900mm, the weir length b1 of the diversion weir 3 is 1.2m, and the weir height H1 is 0.8m.

[0064] According to the hydraulic formula, when the diverted water volume Q1 of the diverter weir 3 is the average treated water volume Q avg -1250m 3 / h, the water head h on the diversion weir 3 is calculated by formula (1). 1avg -0.276m. Then the liquid level H of the diversion chamber 2, i.e. the height of the overflow weir 61, is calculated as H2 = H1 + h 1avg =1.076m.

[0065] When the water flow of the water inlet main pipe 1 is Q i Reach the maximum water inflow Q imax =8300m 3 / h, the diverted water volume Q1 of the diverter weir 3 is the maximum designed treated water volume Q max =2125m 3 / h, and the water head on the weir h is calculated according to the formula (4) 1max=0.393m. At this time, the liquid level in the diversion chamber 2 reaches the highest value H3 = H1 + h 1max =1.193m, then the highest water head on the overflow weir 61 is h 2avg =H3-H2=0.117m. The amount of water overflowing through the overflow weir 61 is Q2=Q imax -Q max =6175m 3 / h, the total weir length b2 = 21.6 m required for the overflow weir 61 can be calculated according to formula (7).

[0066] In this embodiment, the overflow weir trough 6 is made of stainless steel in a U-shaped groove, wherein each overflow weir trough 6 is formed by two overflow weirs 61 arranged opposite to each other and the ground to form a U-shaped groove. According to the actual needs on site, the width of each overflow weir trough 6 is determined to be 0.6m and the depth is 0.7m. There are two overflow weir troughs 6, so the number of overflow weirs 61 is n=4, and the length of each overflow weir 61 is That is, the length L1 in the diversion chamber 2 is 5.4m; then according to the diameters of the diversion outlet pipe 5 and the overflow outlet pipe 8 and combined with the convenience of construction, the width L2 of the diversion collection chamber 4 and the overflow collection chamber 7 is determined to be 0.8m; given the diameter of the water inlet main pipe 1 DN1000mm, the width and number of the overflow weir grooves 6, and the weir length b1 of the diversion weir 3, it is determined that the total width B of the diversion chamber 2 is at least greater than the sum of the former, B=3.7m.

[0067] According to the above calculation structure, a simple and efficient water diversion device can be designed to achieve the following: avg =1250m 3 / h, all sewage can enter the reclaimed water plant; when the water flow rate of the sewage trunk pipe is greater than the average treatment water volume of the designed reclaimed water plant, the amount of water diverted into the reclaimed water plant will increase accordingly, but even if the water flow rate of the sewage trunk pipe reaches the maximum value of 8300m 3 / h, the amount of water diverted to the reclaimed water plant will not exceed the maximum designed water inflow of the reclaimed water plant, 2125m 3 / h, thus achieving a stable diversion effect.

[0068] Example 2

[0069] A combined sewer pollution control project, a new treatment capacity of 30000m 3 / d sewage treatment plant to treat dry season sewage, that is, Q avg =1250m 3 / h. The diameter of the confluence pipe is DN1000mm, and the maximum flow rate is Q imax =8300m 3 / h. The maximum water inflow requirement of the sewage treatment plant shall not exceed 15% of the average water volume, that is, Q max =K Z ×Q avg =1437.5m 3 / h.

[0070] If the first-level diversion facility is used, the water head h above the diversion weir 3 is calculated according to the above method. 1avg =0.276m, the height of overflow weir 61 H2 =1.076m, the water head on diversion weir 3 h 1max =0.303m, Q2=6862.5m 3 / h, the highest water head on overflow weir 61 h 2max =0.027m, and the total weir length b2 required for the overflow weir 61 is calculated to be 210m. At this time, the required diversion device is too large and obviously cannot be implemented.

[0071] To this end, two water diversion devices can be used in series (the diversion outlet pipe 5 of the primary water diversion device is connected in series with the water inlet main pipe 1 of the secondary water diversion device), such as Figure 6 The two-stage water diversion device adopts the same size as that of Example 1, so the maximum overflow rate Q2 of the first-stage water diversion device is 6175m 3 / h, the maximum flow rate of the primary water diversion device is Q2 = Q max 2125m 3 / h. The maximum flow rate of the primary water diversion device is the maximum water inflow of the secondary water diversion device. 1max At this time, the maximum liquid level H3 of the diversion chamber 2 of the second-stage diversion facility will reach 1.103m, and the water head h on the diversion weir 3 1max The maximum flow rate Q1 of the secondary water diversion device is 1437.5m 3 / h; the highest water head on the overflow weir 61 h 2avg The maximum overflow volume of the secondary level is 0.027m, and the maximum overflow volume Q2 is 687.5m 3 / h, just meets the requirement.

[0072] It can be seen that the use of a two-stage series water diversion device can control the maximum diversion water output to less than 115% of the average water volume, achieving more precise water volume control.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A water diversion device, characterized in that: The invention comprises a diverter chamber (2), a diverter water collecting chamber (4) and an overflow water collecting chamber (7); a diverter weir (3) is arranged between the diverter chamber (2) and the diverter water collecting chamber (4); the diverter chamber (2) and the overflow water collecting chamber (7) are connected via an overflow weir groove (6); the overflow weir groove (6) is arranged in the diverter chamber (2); a water inlet main pipe (1) is arranged on the diverter chamber (2); a diverter water outlet pipe (5) is arranged on the diverter water collecting chamber (4); and an overflow water outlet pipe (8) is arranged on the overflow water collecting chamber (7); and a wellbore (9) is arranged on the top surface of the diverter chamber (2).

2. The water diverter according to claim 1, characterized in that: The overflow weir trough (6) comprises two overflow weirs (61) vertically and oppositely arranged and a U-shaped trough formed by a trough bottom, wherein the trough bottom is away from the bottom surface of the diversion chamber (2).

3. The water diverter according to claim 2, characterized in that: The overflow weir (61) is a rectangular thin-walled weir.

4. The water diverter according to claim 1, characterized in that: The top surface elevation of the diversion weir (3) is lower than the top surface elevation of the overflow weir trough (6).

5. The water splitter according to claim 1, characterized in that: The bottom elevation of the diversion water collection chamber (4) is lower than the bottom elevation of the diversion chamber (2).

6. The water splitter according to claim 1, characterized in that: The bottom elevation of the overflow water collecting chamber (7) is lower than the bottom elevation of the diversion chamber (2).

7. The water splitter according to claim 1, characterized in that: A plurality of overflow weir grooves (6) are arranged side by side, and intervals are provided between adjacent overflow weir grooves (6).

8. The water splitter according to claim 1, characterized in that: The diverter weir (3) is a rectangular thin-walled weir.

9. A water diversion system, characterized in that: It comprises at least two water diverter devices according to any one of claims 1 to 5 connected in series, wherein the two water diverter devices are a primary water diverter device and a secondary water diverter device arranged in sequence according to the water flow direction, and the diversion outlet pipe (5) of the primary water diverter device is connected to the water inlet main pipe (1) of the secondary water diverter device.

10. The water diversion system according to claim 9, characterized in that: The overflow outlet pipe (8) of the primary water dividing device is arranged in parallel with the overflow outlet pipe (8) of the secondary water dividing device.

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