Intelligent water level adjusting method of weir plate system

Abstract

The invention relates to an intelligent water level adjusting method of a water weir plate system, the water weir plate system is arranged in a first pool body, the water weir plate system comprises a weir plate, a power unit and a monitoring unit, a corresponding mode is selected based on the difference value among H, h and hQ, and the weir plate is intelligently controlled to ascend or descend or stop so as to complete intelligent adjustment of the weir plate. On one hand, the conditions that the rising speed of the weir plate is obviously smaller than the rising speed of the water level, the weir plate is smaller than or equal to the water level behind the weir plate, and water-making flocculation reaction is abnormal due to turbulent flow and backflow can be avoided; on the other hand, potential energy loss can be effectively controlled based on water level control, potential energy possibly wasted originally is converted into effective work (such as power generation and water supply) by accurately matching requirements and resources, and meanwhile the safety risk and maintenance cost of system operation are reduced.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering, and specifically relates to an intelligent water level regulation method for a weir plate system. Background Technology

[0002] A weir system is a commonly used device for monitoring water flow and regulating water level inside equipment. It effectively controls fluid flow rate. By adjusting the height or position of the weir, the area through which the fluid passes can be changed, thereby regulating the flow rate. It can also be used to regulate water level. By controlling the opening degree of the weir, the water level inside the equipment can be kept within a suitable range, avoiding damage or disruption to the normal operation of the equipment caused by excessively high or low water levels. It also prevents fluid backflow. Furthermore, the water flow over the weir is an active design feature in water treatment processes. Its core objectives include stabilizing water level, improving solid-liquid separation efficiency, and achieving intelligent silt flushing. Its effectiveness depends on precise structural design (such as horizontal weir crest and adjustable supports) and strict operation and maintenance (anti-clogging and regular calibration). Abnormal weir overflow requires targeted investigation of blockages, deformation, or overload issues to ensure the water plant continues to operate in compliance with standards.

[0003] However, when a large flow of water overcomes a weir, not only is there potential energy loss, but the smaller the ratio of the actual flow rate to the design flow rate, the greater the potential energy loss. The main reasons are:

[0004] 1. Design institutes generally use fixed weirs calculated based on the most unfavorable point in hydraulic calculations, and the correlation coefficients are often overvalued, sometimes even rounded to integers, resulting in an overly large safety factor. Actual water usage fluctuates within a relatively small range, and the most unfavorable point only occurs for a few dozen hours throughout the year.

[0005] 2. When drawing the construction drawings, the relevant errors of civil engineering and equipment installation are taken into account, and an additional safety factor is reserved;

[0006] 3. The design is basically based on the maximum flow rate of the water plant or sewage treatment plant. Theoretically, whether it is the slope of the pipeline, local losses, or the hydraulic calculation of the water-passing structure, they are all directly positively correlated with the flow velocity and the square of the flow velocity. Under low flow velocity conditions, the fixed weir plate will inevitably cause the water pump to raise the water level to an unnecessary height, resulting in an unnecessary increase in power consumption. Some designs have a manual adjustment plate on the fixed weir plate. Since the flow rate of the water plant varies greatly every day, and the temperature difference will also cause the daily output to vary, each manual adjustment requires water shutdown construction, which takes a long time. Manual adjustment is impractical. To date, only a few water plants may make adjustments during the linkage commissioning process after the completion of the water plant construction. It is impossible to manually adjust the adjustment plate at other times. Therefore, it is impossible to achieve the expected energy saving and consumption reduction goals based on actual operating conditions. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an improved intelligent water level regulation method for a weir plate system.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A method for intelligent water level regulation of a weir plate system, wherein the weir plate system is arranged in a first pool body, and the weir plate system includes a weir plate, a power unit, and a monitoring unit. The monitoring unit includes a first rangefinder located above the power unit and a second rangefinder located in the first pool body and behind the weir plate.

[0010] H = S 总 -S1-S2(Equation 1);

[0011] h = S 总 -S3(Equation 2);

[0012] H is the height of the weir plate; S 总 S1 is the distance from the second rangefinder to the bottom of the first pool; S2 is the distance from the top of the weir plate to the top of the power unit; S3 is the distance from the second rangefinder to the water level below; h is the water level height obtained by the second rangefinder; h Q The expected flow height; and based on H, h, and h Q The difference between the two values ​​controls the raising, lowering, or stopping of the weir plate, including: Mode 1, when Hh ≤ 2.0cm, the power unit drives the weir plate to rise until Hh ≥ 3.5cm, at which point the weir plate stops rising; Mode 2, when Hh ≥ 5.0cm, the power unit drives the weir plate to fall until Hh ≤ 3.5cm, at which point the weir plate stops rising; Mode 3, h... Q When H ≥ 3.0 cm, the power unit drives the weir plate to rise until Hh Q When the height reaches ≥1cm, the weir plate stops rising.

[0013] Preferably, the monitoring unit further includes a third rangefinder for monitoring the water level of the second pool, wherein the first pool and the second pool are connected by a pipeline, there are multiple second pools, and they are divided into two groups. The water level height measured by the third rangefinder corresponding to the second pool is D, and h = h x +D (Equation 3), ∑il=l1i1+l2i2+l3i3+l4i4 (Equation 5), where h x h1 represents the hydraulic loss along the pipeline; h2 represents the head loss along the pipeline; h3 represents the head loss at local points. 1、2、3、4 The length of the tube from the first pool to the second pool in each group; l 1、2、3、4 Average flow velocity in the pipeline, i 1、2、3、4 For l 1、2、3、4The head loss per unit pipe length is constant and is obtained from the "Water Supply and Drainage Design Manual" based on the pipe diameter and flow velocity v of each pipeline; ξ is the local resistance coefficient, also obtained from the "Water Supply and Drainage Design Manual". In short, by calculating hx, the height of h is further verified. That is, based on the collaboration and verification between the three rangefinders, the movement of the weir plate can be controlled more intelligently, avoiding situations where the weir plate's rising speed is significantly less than the water level's rising speed, or the weir plate is less than or equal to the water level behind the weir plate, causing turbulence, backflow, etc. Conversely, if the weir plate's falling speed is significantly less than the water level's falling speed, the relative position of the weir crest and the water level becomes unbalanced, ultimately resulting in deteriorated flow patterns, reduced flow capacity, and structural safety risks.

[0014] Specifically, see Volume 1, "Common Information," of the "Water Supply and Drainage Design Manual."

[0015] In some specific embodiments, there are N second pools, where N ≥ 2 and is an even number. These N second pools are divided into two groups, with symmetrically distributed piping between the groups. The flow rate of each second pool is 1 / N of the total flow rate. h can also be obtained based on the flow rate. Q .

[0016] Alternatively, there are N second pools, where N = 4 and is an even number. Four of these second pools are divided into two groups, with asymmetrical piping distribution between the groups. The flow rate of each second pool is calculated using the following set of equations, Formula 1: (in Formula 2: (in Formula 3: (in );

[0017] Formula 4: Q = Q1 + Q2 + Q3 + Q4. This can be derived from the above four formulas, where Q is the total flow rate, and l1, l2, l5, l6, l7, and l8 are the lengths of the pipelines used in the first group. The pipelines used in the first group include tee joint I, and three bends (first, second, and third) connected to tee joint I via pipes. The first pool body is connected to the first bend via the first pipe body, and the second and third bends are connected to the corresponding second pool bodies via pipes. l1 is the distance from the first pool body to the first bend; l2 is the distance from the first bend to tee joint I; l5 and l7 are the lengths from tee joint I to the second and third bends respectively; l6 and l8 are the lengths from the second and third bends to the corresponding second pool bodies respectively; l3, l4, l9, l 10 l 11 l 12The length of the pipeline used in the second group; the pipeline used in the second group includes tee connector II, and the fourth, fifth, and sixth bends connected to the three interfaces of tee connector II by pipes respectively. The first pool body is connected to the fourth bend through the third pipe body, and the fifth and sixth bends are connected to their corresponding second pool bodies by pipes. l3 is the distance from the first pool body to the fourth bend, and l4 is the distance from the fourth bend to tee connector II; l9 and l 11 The lengths from T-joint II to the fifth and sixth bends respectively; l6l 10 and l 12 The lengths from the fifth and sixth bends to the corresponding second pool bodies; ξ, i, v, and d correspond one-to-one with each pipeline and their values ​​are all constants, i.e., Q1, Q2, Q3, and Q4 are obtained.

[0018] Preferably, for old steel pipes and old cast iron pipes, when v < 1.2 m / s, When v ≥ 1.2 m / s, Where i is the head loss per meter of pipe, d j Let v be the inner diameter of the pipe, and v be the average flow velocity in the pipe.

[0019] Preferably, for concrete pipes, reinforced concrete pipes, and the remaining various pipework systems Where v is the average flow velocity in the pipe, R is the hydraulic radius, and C is the velocity coefficient. Where n is the roughness coefficient, which takes a value of 0.013-0.014. In specific calculations, the roughness coefficient should be determined according to the smoothness of the inner wall of the pipe.

[0020]

[0021] l1×i1 is the layer loss of the first segment, and l2×i2 is the layer loss of the second segment;

[0022] l3×i3 is the layer loss of the third segment, and l4×i4 is the layer loss of the fourth segment;

[0023]

[0024] Taking one branch of the first group as the standard, the calculation is as follows:

[0025] h 弯1 For the hydraulic loss corresponding to the first bend, at 90°, ξ is taken as 1.08; h 弯2 For the hydraulic loss corresponding to the second bend, at 90°, ξ is taken as 1.08; h 三通 For the hydraulic loss corresponding to T-joint I, at 90°, ξ is taken as 1.5; h 变径The hydraulic loss corresponding to the change in the pipe connecting the first pipe to the second pool is ξ, with a value of 0.33; h 阀1 The hydraulic loss of the butterfly valve located on the first pipeline is ξ, which is taken as 0.1; h 阀2 The hydraulic loss of the butterfly valve on the pipeline connecting the second elbow to the tee joint I is calculated to be ξ, which is set to 0.1.

[0026]

[0027] Under asymmetric arrangement conditions, the values ​​of the flow velocity v in the equation system are: Similarly, obtain the data of other pipelines in the first and second groups to obtain Q1, Q2, Q3, and Q4.

[0028] According to another specific embodiment and preferred aspect of the present invention, the first and second rangefinders are arranged at the same height at the top of the first pool body. That is, under the same reference, the water level or height information is obtained more accurately, which facilitates the intelligent adjustment of the weir plate.

[0029] Preferably, an early warning system is set so that when Hh ≤ 1.5cm, a high liquid level alarm is triggered, and the weir plate rises after the high liquid level alarm is triggered.

[0030] Preferably, an early warning system is set so that when Hh ≥ 5.5cm, a low liquid level alarm is triggered, and the weir plate descends after the low liquid level alarm is triggered.

[0031] Preferably, an early warning system is set, h Q When -H≥3.5cm, a high liquid level alarm will be triggered, and the weir plate will rise after the high liquid level alarm is triggered.

[0032] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0033] In existing weir-plate water level regulation systems, large-flow water not only suffers potential energy loss during the process of overcoming the weir, but also exhibits a problem where the smaller the ratio of actual flow to design flow, the greater the potential energy loss. The main reasons are: design institutes generally use fixed weirs calculated based on the most unfavorable point in hydraulic calculations, and the correlation coefficients are often overestimated, sometimes even rounded to integers, resulting in an overly large safety factor. Actual water usage fluctuates within a relatively small range, and the most unfavorable point only occurs for a few dozen hours throughout the year. Construction drawings, considering errors related to civil engineering and equipment installation, include additional safety factors. Designs are generally based on the maximum flow rate of the water or sewage treatment plant. Theoretically, both pipeline slope and local losses, as well as the hydraulic calculations of water-passing structures, are directly positively correlated with flow velocity and the square of the flow velocity. Under low flow velocity conditions, fixed weirs inevitably cause pumps to raise the water level to unnecessary heights, resulting in electrical... The current design avoids unnecessary increases in unit consumption. While some designs incorporate manual adjustment plates on fixed weir plates, the daily flow rate of the water plant varies significantly, and temperature fluctuations cause daily output variations. Each manual adjustment requires water shut-off for construction, which is time-consuming and impractical. To date, adjustments are only made once during the commissioning process after the water plant's construction is completed; manual adjustment of the adjustment plates is not feasible at other times. Therefore, it cannot achieve the desired energy saving and consumption reduction goals based on actual operating conditions. This invention addresses these shortcomings by providing a comprehensive intelligent water level adjustment method for weir plate systems. This method cleverly solves the deficiencies and defects of existing technologies. Using this intelligent water level adjustment method, a rangefinder acquires information such as the weir plate, water level height, and dynamic position, and derives the relationship between the weir plate and the water level. Then, based on H, h, and h... Q By selecting the corresponding mode based on the difference between the values, the weir plate is intelligently controlled to rise, fall, or stop, thus completing the intelligent adjustment of the weir plate. Therefore, this invention can intelligently control the movement of the weir plate, avoiding situations where the rising speed of the weir plate is significantly less than the rising speed of the water level, or the weir plate is less than or equal to the water level behind the weir plate, causing turbulence, backflow, etc. On the other hand, based on the control of the water level, it can effectively control potential energy loss. By accurately matching demand and resources, potential energy that might otherwise be wasted can be converted into effective work (such as power generation and water supply), while reducing the safety risks and maintenance costs of system operation. Attached Figure Description

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a schematic diagram of a section of the weir plate system in this embodiment;

[0036] Figure 2 for Figure 1 Schematic diagram of a local structure in the middle;

[0037] Figure 3 This is a control principle diagram for this embodiment;

[0038] Figure 4 This is a schematic diagram of the pipeline connection in this embodiment;

[0039] The components are: 1. First pool body; 2. Second pool body; 3. Pipeline; B. Weir plate system; b1. Weir plate; b2. Power unit; b20. Power screw; b21. Motor; b3. Monitoring unit; b31. First rangefinder; b32. Second rangefinder; b33. Third rangefinder; a. T-joint I; b. First elbow; c. Second elbow; d. Third elbow; e. First pipe body; a′. T-joint II; b′. Fourth elbow; c′. Fifth elbow; d′. Sixth elbow; e′. Third pipe body. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0045] like Figures 1 to 4 As shown in the figure, the intelligent water level adjustment method of the weir plate system in this embodiment is provided. The weir plate system B is arranged in the first pool 1, and a second pool 2 is provided downstream of the first pool 1. The first pool 1 and the second pool 2 are connected by a pipeline 3.

[0046] Specifically, the weir plate system B includes a weir plate b1, a power unit b2, and a monitoring unit b3. The power unit b2 includes a power screw b20 and a motor b21. The monitoring unit b3 includes a first rangefinder b31 located above the power unit, a second rangefinder b32 located in the first pool 1 and behind the weir plate b1, and a third rangefinder b33 used to monitor the water level in the second pool 2. The first rangefinder b31 and the second rangefinder b32 are arranged at the same height on the top of the first pool 1. That is, under the same reference, the water level or height information is obtained more accurately, which facilitates the intelligent adjustment of the weir plate.

[0047] In this example, there are four pools 2, divided into two groups. The water level height corresponding to pool 2 measured by the third distance measuring instrument is D, and h = h x+D (Equation 3), ∑il=l1i1+l2i2+l3i3+l4i4 (Equation 5), where h x h1 represents the hydraulic loss along the pipeline; h2 represents the head loss along the pipeline; h3 represents the head loss at local points. 1、2、3、4 v is the length of the tube from the first pool to the second pool in each group; l is the length of the tube from the first pool to the second pool in each group. 1、2、3、4 Average flow velocity in the pipeline, i 1、2、3、4 For l 1、2、3、4 The head loss per unit pipe length is constant and is obtained from the *Water Supply and Drainage Design Manual* based on the pipe diameter and flow velocity v of each pipeline; ξ is the local resistance coefficient, also obtained from the *Water Supply and Drainage Design Manual*. Specifically, in the *Common Information* section of Volume 1 of the *Water Supply and Drainage Design Manual*, hx is calculated to further verify the height of h. That is, based on the collaboration and verification between the three rangefinders, the weir plate movement can be controlled more intelligently to avoid situations where the weir plate's rising speed is significantly less than the water level's rising speed, or the weir plate is less than or equal to the water level behind it, causing turbulence, backflow, etc. Conversely, if the weir plate's falling speed is significantly less than the water level's falling speed, the relative position of the weir crest and the water level becomes unbalanced, ultimately resulting in deteriorated flow patterns, reduced flow capacity, and structural safety risks.

[0048] Meanwhile, there are two pipeline layout options: ① symmetrical layout; ② asymmetrical layout. For ①, the symmetrical layout, the four second pools are divided into two groups, with the pipelines symmetrically distributed between the two groups. The flow rate of each second pool is 1 / N of the total flow rate. h can also be obtained based on the flow rate. Q .

[0049] For ②, the asymmetrical layout, the four second pools are divided into two groups, and the piping between the two groups is asymmetrically distributed. The flow rate of each second pool is calculated by the following set of equations, Formula 1: (in Formula 2: (in Formula 3:

[0050] (in );

[0051] Formula 4: Q = Q1 + Q2 + Q3 + Q4. This can be derived from the above four formulas, where Q is the total flow rate, and l1, l2, l5, l6, l7, and l8 are the lengths of the pipelines used in the first group. The pipelines used in the first group include a tee joint Ia, and three bends connected to the three ports of tee joint Ia via pipes: a first bend b, a second bend c, and a third bend d. The first pool body 1 is connected to the first bend b via the first pipe body e, and the second bend c and third bend d are connected to the corresponding second pool body 2 via pipes. l1 is the distance from the first pool body 1 to the first bend b; l2 is the distance from the first bend b to the tee joint Ia; l5 and l7 are the lengths from tee joint Ia to the second bend c and third bend d respectively; l6 and l8 are the lengths from the second bend c and third bend d to the corresponding second pool body 2 respectively; l3, l4, l9, l 10 l 11 l 12 The length of the pipeline used in the second group; the pipeline used in the second group includes a tee joint IIa′, and four bends b′, c′, and d′ connected to the three interfaces of the tee joint IIa′ respectively through pipes. The first pool body 1 is connected to the fourth bend b′ through the third pipe body e′, and the fifth bend c′ and sixth bend g′ are connected to the corresponding second pool body 2 through pipes. l3 is the distance from the first pool body 1 to the fourth bend b′, ​​l4 is the distance from the fourth bend b′ to the tee joint IIa′; l9 and l 11 The lengths from the tee joint IIa′ to the fifth bend c′ and the sixth bend d′ respectively; l 10 and l 12 Let c′ be the length from the fifth bend to the sixth bend to the corresponding second pool body 2; ξ, i, v, and d correspond one-to-one with each pipe and their values ​​are all constants, i.e., Q1, Q2, Q3, and Q4 are obtained. For old steel pipes and old cast iron pipes, when v < 1.2 m / s, When v ≥ 1.2 m / s, Where i is the head loss per meter of pipe, d j Let be the inner diameter of the pipe, and v be the average flow velocity in the pipe. This applies to concrete pipes, reinforced concrete pipes, and other various types of pipework. Where v is the average flow velocity in the pipe, R is the hydraulic radius, and C is the velocity coefficient. Where n is the roughness coefficient, which takes a value of 0.013-0.014. In specific calculations, the roughness coefficient should be determined according to the smoothness of the inner wall of the pipe.

[0052] l1×i1 is the layer loss of the first segment, and l2×i2 is the layer loss of the second segment;

[0053] l3×i3 is the layer loss of the third segment, and l4×i4 is the layer loss of the fourth segment;

[0054]

[0055] Taking one branch of the first group as the standard, the calculation is as follows:

[0056] h 弯1 For the hydraulic loss corresponding to the first bend, at 90°, ξ is taken as 1.08; h 弯2 For the hydraulic loss corresponding to the second bend, at 90°, ξ is taken as 1.08; h 三通 For the hydraulic loss corresponding to T-joint I, at 90°, ξ is taken as 1.5; h 变径 The hydraulic loss corresponding to the change in the pipe connecting the first pipe to the second pool is ξ, with a value of 0.33; h 阀1 The hydraulic loss of the butterfly valve located on the first pipeline is ξ, which is taken as 0.1; h 阀2 The hydraulic loss of the butterfly valve on the pipeline connecting the second elbow to the tee joint I is calculated to be ξ, which is set to 0.1.

[0057]

[0058] Under asymmetric arrangement conditions, the values ​​of the flow velocity v in the equation system are: Similarly, obtain the data of other pipelines in the first and second groups to obtain Q1, Q2, Q3, and Q4.

[0059] Based on H, h and h Q The difference between the two values ​​controls the raising, lowering, or stopping of the weir plate, including: Mode 1, when Hh ≤ 2.0cm, the power unit drives the weir plate to rise until Hh ≥ 3.5cm, at which point the weir plate stops rising; Mode 2, when Hh ≥ 5.0cm, the power unit drives the weir plate to fall until Hh ≤ 3.5cm, at which point the weir plate stops rising; Mode 3, h... Q When H ≥ 3.0 cm, the power unit drives the weir plate to rise until Hh Q When the height reaches ≥1cm, the weir plate stops rising.

[0060] Furthermore, warnings are set: when Hh ≤ 1.5cm, a high liquid level alarm is triggered, and the weir plate rises after the high liquid level alarm; when Hh ≥ 5.5cm, a low liquid level alarm is triggered, and the weir plate descends after the low liquid level alarm; h Q When -H≥3.5cm, a high liquid level alarm will be triggered, and the weir plate will rise after the high liquid level alarm is triggered.

[0061] In summary, after adopting this intelligent water level regulation method, the rangefinder obtains information such as the weir plate, water level height, and dynamic position, and derives the relationship between the weir plate and the water level. Then, based on H, h, and h... QBy selecting the corresponding mode based on the difference between the values, the weir plate is intelligently controlled to rise, fall, or stop, thus achieving intelligent adjustment of the weir plate. Therefore, this invention can intelligently control the movement of the weir plate, avoiding situations where the rising speed of the weir plate is significantly less than the rising speed of the water level, or the weir plate is less than or equal to the water level behind the weir plate, causing turbulence, backflow, etc. Conversely, if the falling speed of the weir plate is significantly less than the falling speed of the water level, the relative position of the weir crest and the water level becomes unbalanced, ultimately resulting in deterioration of the water flow pattern, reduced flow capacity, and structural safety risks. On the other hand, based on water level control, potential energy loss can be effectively controlled. By precisely matching demand and resources, potential energy that might otherwise be wasted can be converted into effective work (such as power generation and water supply), while reducing the safety risks of system operation. The third aspect is to calculate and obtain hx, thereby further verifying the height of h. That is, based on the cooperation and verification between the three rangefinders, the movement of the weir plate can be controlled more intelligently. Moreover, i is obtained by referring to the "Water Supply and Drainage Design Manual" according to the pipe diameter and flow velocity v, and ξ is obtained by referring to the "Water Supply and Drainage Design Manual". The fourth aspect is that the first and second rangefinders are arranged at the same height on the top of the first pool body. That is, under the same benchmark, the water level or height information is obtained more accurately, which facilitates the intelligent adjustment of the weir plate. The fifth aspect is to set an early warning: when Hh≤2.0cm, mode one is selected, and when Hh≤1.5cm, a high liquid level alarm is triggered; when Hh≥5.0cm, mode two is selected, and when Hh≥5.5cm, a low liquid level alarm is triggered. Q When -H≥3.0cm, select mode three, and h Q - When H≥3.5cm, a high liquid level alarm is triggered; regarding the sixth aspect, concerning power saving, the first level of understanding is that when both the motor and pump efficiency are 100%, the power consumption for lifting one meter per thousand tons of water is 2.72 kWh; the second level of understanding is that the motor efficiency and pump efficiency are multiplicative, and low efficiency in either one is fatal to power consumption. The product of the two can be taken as 0.6-0.8, therefore, the power consumption for lifting one meter per thousand tons of water is...

[0062] The energy consumption per unit area (kWh) ranges from 4.53 kWh (2.72 / 0.6) to 3.2 kWh (2.72 / 0.8), while the energy consumption per unit area for energy saving in the water supply industry is 380 kWh / km³ / MPa. For a deep-treatment water company with an average daily water supply capacity of 600,000 tons, producing 230 million cubic meters of water annually, the use of automatic regulating weirs can save 0.9 meters of head loss and approximately 880,000 kWh of electricity annually. Nationwide, domestic and industrial water consumption is approximately 189.78 billion cubic meters. Based on the average saving of 0.5 meters of head loss in conventional treatment, the full implementation of automatic regulating weirs could bring 360 million kWh to the water supply industry. Adding the savings of 500 million kWh from sewage treatment plants and other water conservancy facilities, equivalent to over 60 million tons of standard coal, the intelligent regulation of weirs is crucial. It not only improves energy and resource utilization efficiency but also ensures the long-term safety of water conservancy facilities and the sustainability of the ecological environment by stabilizing hydrological conditions. This is one of the core objectives of the "refined and intelligent" management of modern water conservancy projects.

[0063] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A method for intelligent water level regulation of a weir plate system, wherein the weir plate system is arranged in a first pool body, and the weir plate system includes a weir plate, a power unit, and a monitoring unit, characterized in that: The monitoring unit includes a first rangefinder located above the power unit and a second rangefinder located in the first pool body and behind the weir plate. H = S 总 -S1-S2 (Equation 1); h = S 总 -S3 (Equation 2); H is the height of the weir plate; S 总 S1 is the distance from the second rangefinder to the bottom of the first pool; S2 is the distance from the top of the weir plate to the top of the power unit; S3 is the distance from the second rangefinder to the water level below; h is the water level height obtained by the second rangefinder; h Q The expected flow height; and based on H, h, and h Q The difference between the two values ​​controls the raising, lowering, or stopping of the weir plate, including: Mode 1, when Hh ≤ 2.0cm, the power unit drives the weir plate to rise until Hh ≥ 3.5cm, at which point the weir plate stops rising; Mode 2, when Hh ≥ 5.0cm, the power unit drives the weir plate to fall until Hh ≤ 3.5cm, at which point the weir plate stops rising; Mode 3, h... Q When H ≥ 3.0 cm, the power unit drives the weir plate to rise until Hh Q When the height reaches ≥1cm, the weir plate stops rising.

2. The intelligent water level regulation method for the weir plate system according to claim 1, characterized in that: The monitoring unit also includes a third rangefinder for monitoring the water level in the second pool. The first and second pools are connected by a pipeline. There are multiple second pools, divided into two groups. The water level height measured by the third rangefinder in the corresponding second pool is D, where h = h x +D (Equation 3), Where h x h1 represents the hydraulic loss along the pipeline; h2 represents the head loss along the pipeline; h3 represents the head loss at local points. 1、2、3、4 v is the length of the tube from the first pool to the second pool in each group; l is the length of the tube from the first pool to the second pool in each group. 1、2、3、4 Average flow velocity in the pipeline, i 1、2、3、4 For l 1、2、3、4 The head loss per unit pipe length is constant and can be obtained from the "Water Supply and Drainage Design Manual" based on the pipe diameter and flow velocity v of each pipe; ξ is the local resistance coefficient, which can also be obtained from the "Water Supply and Drainage Design Manual".

3. The intelligent water level regulation method for the weir plate system according to claim 2, characterized in that: There are N second pools, where N≥2 and is an even number. The N second pools are divided into two groups, and the pipelines between the two groups are symmetrically distributed. The flow rate of each second pool is 1 / N of the total flow rate.

4. The intelligent water level regulation method for the weir plate system according to claim 2, characterized in that: There are N second-stage tanks, where N = 4 and is an even number. Four of these second-stage tanks are divided into two groups, with asymmetrical piping distribution between the groups. The flow rate of each second-stage tank is calculated using the following set of equations, Formula 1: (in (in Formula 4: Q = Q1 + Q2 + Q3 + Q4. This can be derived from the above four formulas, where Q is the total flow rate, and l1, l2, l5, l6, l7, and l8 are the lengths of the pipelines used in the first group. The pipelines used in the first group include tee joint I, and three bends (first, second, and third) connected to tee joint I via pipes. The first pool body is connected to the first bend via the first pipe body, and the second and third bends are connected to the corresponding second pool bodies via pipes. l1 is the distance from the first pool body to the first bend; l2 is the distance from the first bend to tee joint I; l5 and l7 are the lengths from tee joint I to the second and third bends respectively; l6 and l8 are the lengths from the second and third bends to the corresponding second pool bodies respectively; l3, l4, l9, l 10 l 11 l 12 The length of the pipeline used in the second group; the pipeline used in the second group includes tee connector II, and the fourth, fifth, and sixth bends connected to the three interfaces of tee connector II by pipes respectively. The first pool body is connected to the fourth bend through the third pipe body, and the fifth and sixth bends are connected to their corresponding second pool bodies by pipes. l3 is the distance from the first pool body to the fourth bend, and l4 is the distance from the fourth bend to tee connector II; l9 and l 11 The lengths from T-joint II to the fifth and sixth bends respectively; 10 and l 12 The lengths from the fifth and sixth bends to the corresponding second pool bodies are given; ξ, i, v, and d correspond one-to-one with each pipe and their values ​​are all constants, i.e., Q1, Q2, Q3, and Q4 are obtained.

5. The intelligent water level regulation method for the weir plate system according to claim 4, characterized in that: For old steel pipes and old For cast iron pipes, when v < 1.2 m / s, When v ≥ 1.2 m / s, Where i is the head loss per meter of pipe, d j Let v be the inner diameter of the pipe, and v be the average flow velocity in the pipe.

6. The intelligent water level regulation method for the weir plate system according to claim 5, characterized in that: For concrete pipes, reinforced concrete pipes, and the remaining various pipework systems Where v is the average flow velocity in the pipe, R is the hydraulic radius, and C is the velocity coefficient. Where n is the roughness coefficient, which takes a value of 0.013-0.

014. In specific calculations, the roughness coefficient should be determined according to the smoothness of the inner wall of the pipe. l1×i1 is the layer loss of the first segment, and l2×i2 is the layer loss of the second segment; l3×i3 is the layer loss of the third segment, and l4×i4 is the layer loss of the fourth segment; taking one branch of the first group as the standard, the calculation is as follows: h 弯1 For the hydraulic loss corresponding to the first bend, at 90°, ξ is taken as 1.08; h 弯2 For the hydraulic loss corresponding to the second bend, at 90°, ξ is taken as 1.08; h 三通 For the hydraulic loss corresponding to T-joint I, at 90°, ξ is taken as 1.5; h 变径 The hydraulic loss corresponding to the change in the pipe connecting the first pipe to the second pool is ξ, with a value of 0.33; h 阀1 The hydraulic loss of the butterfly valve located on the first pipeline is ξ, which is taken as 0.1; h 阀2 The hydraulic loss of the butterfly valve on the pipeline connecting the second elbow to the tee joint I is calculated to be ξ, which is set to 0.

1. Under asymmetric arrangement conditions, the values ​​of the flow velocity v in the equation system are: Similarly, obtain the data of other pipelines in the first and second groups to obtain Q1, Q2, Q3, and Q4.

7. The intelligent water level regulation method for the weir plate system according to claim 1, characterized in that: The first and second rangefinders are positioned at the same height on the top of the first pool.

8. The intelligent water level regulation method for the weir plate system according to claim 1, characterized in that: Set an early warning system: when Hh ≤ 1.5cm, a high liquid level alarm will be triggered, and the weir plate will rise after the high liquid level alarm is triggered.

9. The intelligent water level regulation method for the weir plate system according to claim 1, characterized in that: Set an early warning system: when Hh ≥ 5.5cm, a low liquid level alarm will be triggered, and the weir plate will descend after the low liquid level alarm is triggered.

10. The intelligent water level regulation method for the weir plate system according to claim 1, characterized in that: Set an alert, h Q When -H≥3.5cm, a high liquid level alarm will be triggered, and the weir plate will rise after the high liquid level alarm is triggered.

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