CN103995544A - Control device and method for unsteady flow pumping test flow constancy - Google Patents
Control device and method for unsteady flow pumping test flow constancy Download PDFInfo
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- CN103995544A CN103995544A CN201410260350.1A CN201410260350A CN103995544A CN 103995544 A CN103995544 A CN 103995544A CN 201410260350 A CN201410260350 A CN 201410260350A CN 103995544 A CN103995544 A CN 103995544A
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Abstract
The invention belongs to the field of engineering exploration, and particularly relates to a control device and method for unsteady flow pumping test flow constancy. The control device and method are used for testing hydrogeological parameters. The control device comprises a water pump and a water outlet pipeline connected to the water pump, an intelligent flow meter is arranged on the water outlet pipeline, the upstream end and the downstream end of the intelligent flow meter are provided with a first straight pipeline and a second straight pipeline respectively, and the first straight pipeline is communicated with the water outlet pipeline through a filter. The water pump is further connected with a frequency conversion controller through a wire, and the frequency conversion controller is further connected with the intelligent flow meter through a wire. Feedback signal values, corresponding to actual flow transfer currents, measured by a sensor of the intelligent flow meter are compared with an objective signal value, PID control parameters are adjusted, the rotating speed of the water pump is dynamically adjusted, and then constant control and real-time monitoring of water outlet flow are achieved. The device is simple in structure, high in measuring accuracy and convenient to operate, and the method is easy and convenient to operate, high in accuracy, and capable of saving labor and time.
Description
Technical field
The invention belongs to engineering exploration field, relate in particular to a kind of control device and control method of the unsteady flow pumping test constant flow for hydrogeological parameter test.
Background technology
In engineering exploration field, ground water aquifer hydrogeological parameter is to determine the degree of water-rich in water-bearing zone, evaluates the important evidence of wellhole capacity of outlet water and engineering design, hydrogeological parameter obtain common employing shop experiment or on-the-spot bailing test is determined.Shop experiment needs on-the-spot original position to fetch earth, and is subject to sample representation, the factors such as disturbance that fetch earth affect, and test findings often can not accurately reflect actual conditions.On-the-spot bailing test is by drawing water to test scene, water-bearing zone, by drawdown and the corresponding water yield data of wellhole of actual measurement, select suitable computing formula, can obtain the relevant hydrogeological parameter in water-bearing zone, test findings is more reliable compared with laboratory test results.
On-the-spot bailing test is divided into Pumping Test for Steady Flow and unsteady flow pumping test, and Pumping Test for Steady Flow requires within the certain lasting time water flow and water level simultaneously relatively stable.Unsteady flow pumping test, be in pumping and drilling, only keep the water yield to stablize and water level is constantly changed, or only keep stable level to make the changing bailing test of the water yield, compared with the more approaching reality of Pumping Test for Steady Flow, and can study more factor, as more stream factor, elasticity are released hydric factor etc.In addition, can survey and ask the more parameter in water-bearing zone by astable bailing test, as coefficient of transmissibility (T), overtopping flow factor (B), coefficient of pressure conductivity (a), infiltration coefficient (K) and specific yield (μ) or storativity (S).
While adopting constant flow unsteady flow pumping test, the quantitative control of flow is subject to the impact of underground water seepage discharge, although regulation bore flooding quantity amplitude of variation should be not more than 3%, but because underground water seepage discharge is difficult to accurate estimation, the selection difficulty of suitable water pump is larger, thereby causes water flow to be difficult to control.In actual bailing test process, generally by installing return water system additional at pumping line, or install back water system by installing Xiang Bing weir, weir case sidewall additional, and passed back into the mode of the water yield in boring (or well) by the control of return water system valve, realize the constant flow control of aquifer yield.Although said method can be realized the control of water flow, but need to install flowmeter additional or calculate discharge by measuring the weir case crest of weir depth of water, manually adjust return water system valve according to the situation of change of water flow and realize the constant of water flow, manual operation not only precision is lower, and time-consuming.
Summary of the invention
The object of the invention is to overcome the deficiency of unsteady flow pumping test flow control and measuring technique in existing hydrogeological exploration, and provide a kind of control device and control method for constant flow unsteady flow pumping test constant flow, in the time carrying out bailing test, can and need dynamic adjustments water flow according to the object of bailing test, realize the substantially constant of flow, and can monitor aquifer yield.
The technical solution adopted in the present invention:
A kind of control device of unsteady flow pumping test constant flow, comprise water pump and be connected to the outlet conduit on water pump, it is characterized in that: on described outlet conduit, be provided with and there is instantaneous delivery Presentation Function and electric current and become the intelligent flow meter that send function, the upstream extremity of described intelligent flow meter and downstream end are respectively arranged with the first straight pipeline and the second straight pipeline, and wherein the first straight pipeline is connected with outlet conduit by filtrator; On described water pump, be also connected with the frequency-variable controller with pid control function for it is controlled by electric wire, described frequency-variable controller is also connected with intelligent flow meter by electric wire.
On described outlet conduit, be also provided with gas relief line, one end of gas relief line is connected with outlet conduit.
The water inlet end of described gas relief line is provided with pressure regulator valve.
On described outlet conduit, be provided with operation valve, operation valve is positioned at gas relief line and outlet conduit junction upstream position.
Described pressure regulator valve and operation valve are ball valve or butterfly valve.
The length L 1 of described the first straight pipeline is greater than 20 times of nominal diameter D of intelligent flow meter, and the length L 2 of described the second straight pipeline is greater than 5 times of nominal diameter D of intelligent flow meter.
Described intelligent flow is counted turbo flow meter.
On described frequency-variable controller, being provided with current signal input end and simulating signal holds jointly, described intelligent flow meter provides electric energy by accumulator, the positive pole of the analog current output terminal of described intelligent flow meter is connected with battery positive voltage by electric wire, the negative pole of its analog current output terminal is connected with the current signal input end of frequency-variable controller by electric wire, and described battery terminal negative is connected with the common end of simulating signal of frequency-variable controller.
A control method for unsteady flow pumping test constant flow, it comprises the following steps:
Step 1), by the frequency-variable controller electricity that switches on power, according to the specifications and models of frequency-variable controller, the parameter of frequency-variable controller is set, open PID function and be set to and feedback control model by analog current signal;
Step 2), goal-selling signal value, echo signal value is current signal value corresponding to water flow expection stationary value, the percentage that accounts for intelligent flow meter flow range with water flow expection stationary value represents;
Step 3), closed control valve, and open pressure regulator valve to maximum opening simultaneously, and starting the operation button of frequency-variable controller, water pump will start and water outlet simultaneously, open gradually operation valve and make slow water-filling in intelligent flow meter, and synchronously slowly reduce reduction valve aperture to closed condition;
Step 4), observe the flow concussion situation that intelligent flow meter shows, utilize pid parameter setting method to adjust the parameter of frequency-variable controller, reach aquifer yield constant.
The parameter of described frequency-variable controller comprise proportional gain P, integral time I and derivative time D.
Beneficial effect of the present invention:
1, the present invention can realize quantitative control and the Real-Time Monitoring of constant flow unsteady flow pumping test water flow simultaneously.
2, the present invention utilizes the pid control function of frequency-variable controller, by adjusting of pid parameter, can realize the constant control of bailing test aquifer yield.
3, water flow of the present invention can accurately be measured and be shown in real time by intelligent flow meter, and variable the sending of the flow signal of measuring feeds back to frequency-variable controller for current signal, the echo signal that frequency-variable controller is set according to pid parameter and the comparison of feedback signal, adjust in real time frequency-variable controller operational factor, guarantee that water flow is constant.
4, the present invention can regulate in the cooperation by operation valve and reduction valve, guarantee starting mode of pump after instantaneous high pressure current flowmeter sensor is impacted and is damaged.
5, control method of the present invention understands, simple in structure, control accuracy is high and easy to operate.
Brief description of the drawings
Fig. 1 is the control device structural drawing of unsteady flow pumping test constant flow of the present invention.
Embodiment
As shown in Figure 1, a kind of control device of unsteady flow pumping test constant flow, comprise frequency-variable controller 1, intelligent flow meter 2, be accumulator 3, water pump 4, filtrator 5 and the gas relief line 8 that frequency-variable controller 1 and intelligent flow meter 2 are powered, wherein, frequency-variable controller 1 has pid control function, and can input 4-20mA simulating signal; Intelligent flow meter 2 is turbo flow meter, has instantaneous delivery Presentation Function and electric current and becomes and send function, exportable 4-20mA flow conversion current analog signal.The water delivering orifice of water pump 4 is provided with outlet conduit 21, intelligent flow meter 2 is installed on outlet conduit, the upstream extremity of intelligent flow meter 2 and downstream end are separately installed with the first straight pipeline 6 and the second straight pipeline 7, and the first straight pipeline 6 and the second straight pipeline 7 inner wall smooths are clean, without indenture, the defect such as incrustation and peeling, wherein the first straight pipeline 6 is connected with outlet conduit 21 by filtrator 5, the length L 1 of the first straight pipeline 6 is greater than 20 times of nominal diameter D of intelligent flow meter, the length L 2 of described the second straight pipeline 7 is greater than 5 times of nominal diameter D of intelligent flow meter, filtrator 5 is for filtered water impurity, in case intelligent flow meter 2 is caused to damage, gas relief line 8 is also installed on outlet conduit, and the left end of gas relief line 8 is connected with outlet conduit 21, and gas relief line 8 is installed on the upstream position that is positioned at filtrator 5 on outlet conduit 21, operation valve 9 is installed on outlet conduit 21, operation valve 9 is positioned at the junction upstream position of gas relief line 8 and outlet conduit 21, the water inlet end of gas relief line 8 is provided with pressure regulator valve 10, operation valve 9 and pressure regulator valve 10 are ball valve or butterfly valve, by the pressure regulator valve 10 of gas relief line 8 stems and coordinating of operation valve 9, adjust water pump 4 and enter the water yield in intelligent flow meter 2 while starting, can avoid instantaneous current high speed impact intelligent flow flowmeter sensor and cause intelligent flow meter to damage.Water pump 4 is connected with frequency-variable controller 1 by electric wire 14 with intelligent flow meter 2, frequency-variable controller 1 is provided with current signal input end 19 and the common end 18 of simulating signal, intelligent flow meter 2 provides electric energy by accumulator 3, the positive pole 16 of the analog current output terminal of intelligent flow meter 2 is connected with battery positive voltage 15 by electric wire, the negative pole logical 20 of its analog current output terminal is crossed electric wire and is connected with the current signal input end 19 of frequency-variable controller 1, and the negative pole 17 of accumulator 3 is connected with the common end 18 of the simulating signal of frequency-variable controller 1; The specified power ratio control of frequency-variable controller 1 should be greater than the rated power of water pump 4.The flow measurement range of intelligent flow meter 2 should comprise bailing test desired flow controlling value.The supply voltage of accumulator 3 should match with the specified input voltage of frequency-variable controller 1 and intelligent flow meter 2.
In the time utilizing the present invention to carry out bailing test, first according to the specification of intelligent flow meter 2, adopt screw thread or flange mode to be connected with the first straight pipeline 6, the second straight pipeline 7, and be connected with filtrator 5, operation valve 9, pressure regulator valve 10 and gas relief line 8, then be connected with the rising pipe 21 of water pump 4, the first straight pipeline 6, the second straight pipeline 7 keep horizontal positioned.Then, the positive pole of accumulator 3 15 is connected with the positive pole 16 of intelligent flow meter 2 analog current signal output terminals, negative pole 17 is connected with the common end 18 of frequency-variable controller 1 simulating signal, and 1 time control current signal input end 19 of frequency-variable controller is connected with the negative pole 20 of intelligent flow meter 2 analog current signal output terminals.Finally, the control terminal of frequency-variable controller 1 13 is connected with the corresponding line order of water pump 4 service cable lines 14, the power supply terminal of frequency-variable controller 1 12 is connected with the corresponding line order of the terminals 11 of power supply.
While carrying out constant flow unsteady flow pumping test, first, connect power supply 11 and power for frequency-variable controller 1, according to the specifications and models of frequency-variable controller, the basic parameter of frequency-variable controller 1 is set by parameter, opens PID function and be set to and feedback control model by analog current signal; Secondly, goal-selling signal value, echo signal value is current signal value corresponding to water flow expection stationary value, the percentage that generally accounts for intelligent flow meter 2 flow ranges with water flow expection stationary value represents; Then, closed control valve 9, and open pressure regulator valve 10 to maximum opening simultaneously, start the operation button of frequency-variable controller 1, water pump 4 will start and water outlet simultaneously, open gradually operation valve 9 and make slow water-filling in intelligent flow meter 2, and synchronously slowly reduce reduction valve 10 apertures to closed condition, impact the sensor of flowmeter 2 and cause damage to reduce instantaneous starting High-Pressure Water.
In practical operation, the flow concussion situation showing by Real Time Observation intelligent flow meter 2, adjust frequency-variable controller 1 proportional gain P, integral time I and derivative time D, conventional parameter tuning method has the experience method scene of also crying to gather examination method, die-away curve method, aritical ratio band method and response curve method etc., below mainly rely on engineering experience, directly in the test of control system, carry out, method is simple, be easy to grasp, and in engineering reality, is widely adopted.Taking empirical method as example, concrete set-up procedure is: (1) determines proportional gain P: while determining proportional gain P, first remove integration item and the differential term of PID, set integral time I and derivative time D be 0, making PID is that pure ratio regulates, it is peaked 60%～70% that input is set as that system allows, and strengthens gradually proportional gain P by 0, occurs vibration until intelligent flow meter 2 shows flow value; Again conversely, reduce gradually from proportional gain P now, until vibration disappears, proportional gain P now of record, the proportional gain P that sets PID is currency 60%～70%, proportional gain P has debugged.(2) determine I integral time: after proportional gain P determines, set one larger integral time I initial value, then reduce gradually I, there is vibration until intelligent flow meter 2 shows flow value, afterwards more conversely, strengthen gradually I, until vibration disappears, I now of record, set PID integral time, I was currency 150%～180%, integral time, I debugged.(3) determining D derivative time: derivative time, D generally need not set, is 0, if will set, identical with the method for definite P and I, 30% while getting nonoscillatory.So adjust by pid parameter, can realize the constant of aquifer yield.
Constant flow unsteady flow pumping test requires the substantially constant of bailing test flow, control method by above unsteady flow pumping test constant flow of the present invention can be found out, the present invention utilizes the pid control function of frequency-variable controller, by adjusting of pid parameter, can realize the constant control of bailing test aquifer yield.Water flow can accurately be measured and be shown in real time by intelligent flow meter, and variable the sending of the flow signal of measuring feeds back to frequency-variable controller for current signal, the echo signal that frequency-variable controller is set according to pid parameter and the comparison of feedback signal, adjust in real time frequency-variable controller operational factor, guarantee that water flow is constant.
Claims (10)
1. the control device of a unsteady flow pumping test constant flow, comprise water pump and be connected to the outlet conduit on water pump, it is characterized in that: on described outlet conduit, be provided with and there is instantaneous delivery Presentation Function and electric current and become the intelligent flow meter that send function, the upstream extremity of described intelligent flow meter and downstream end are respectively arranged with the first straight pipeline and the second straight pipeline, and wherein the first straight pipeline is connected with outlet conduit by filtrator; On described water pump, be also connected with the frequency-variable controller with pid control function for it is controlled by electric wire, described frequency-variable controller is also connected with intelligent flow meter by electric wire.
2. the control device of unsteady flow pumping test constant flow according to claim 1, is characterized in that: on described outlet conduit, be also provided with gas relief line, one end of gas relief line is connected with outlet conduit.
3. the control device of unsteady flow pumping test constant flow according to claim 2, is characterized in that: the water inlet end of described gas relief line is provided with pressure regulator valve.
4. the control device of unsteady flow pumping test constant flow according to claim 1, is characterized in that: on described outlet conduit, be provided with operation valve, operation valve is positioned at gas relief line and outlet conduit junction upstream position.
5. according to the control device of the unsteady flow pumping test constant flow described in claim 3 or 4, it is characterized in that: described pressure regulator valve and operation valve are ball valve or butterfly valve.
6. the control device of unsteady flow pumping test constant flow according to claim 1, it is characterized in that: the length L 1 of described the first straight pipeline is greater than 20 times of nominal diameter D of intelligent flow meter, the length L 2 of described the second straight pipeline is greater than 5 times of nominal diameter D of intelligent flow meter.
7. the control device of unsteady flow pumping test constant flow according to claim 1, is characterized in that: described intelligent flow is counted turbo flow meter.
8. the control device of unsteady flow pumping test constant flow according to claim 1, it is characterized in that: on described frequency-variable controller, be provided with current signal input end and simulating signal and jointly hold, described intelligent flow meter provides electric energy by accumulator, the positive pole of the analog current output terminal of described intelligent flow meter is connected with battery positive voltage by electric wire, the negative pole of its analog current output terminal is connected with the current signal input end of frequency-variable controller by electric wire, and described battery terminal negative is connected with the common end of simulating signal of frequency-variable controller.
9. a control method for unsteady flow pumping test constant flow, is characterized in that: it comprises the following steps:
Step 1), by the frequency-variable controller electricity that switches on power, according to the specifications and models of frequency-variable controller, the parameter of frequency-variable controller is set, open PID function and be set to and feedback control model by analog current signal;
Step 2), goal-selling signal value, echo signal value is current signal value corresponding to water flow expection stationary value, the percentage that accounts for intelligent flow meter flow range with water flow expection stationary value represents;
Step 3), closed control valve, and open pressure regulator valve to maximum opening simultaneously, and starting the operation button of frequency-variable controller, water pump will start and water outlet simultaneously, open gradually operation valve and make slow water-filling in intelligent flow meter, and synchronously slowly reduce reduction valve aperture to closed condition;
Step 4), observe the flow concussion situation that intelligent flow meter shows, utilize pid parameter setting method to adjust the parameter of frequency-variable controller, reach aquifer yield constant.
10. the control method of unsteady flow pumping test constant flow according to claim 9, is characterized in that: the parameter of described frequency-variable controller comprise proportional gain P, integral time I and derivative time D.
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| CN201410260350.1A CN103995544A (en) | 2014-06-13 | 2014-06-13 | Control device and method for unsteady flow pumping test flow constancy |
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| CN201410260350.1A CN103995544A (en) | 2014-06-13 | 2014-06-13 | Control device and method for unsteady flow pumping test flow constancy |
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Cited By (7)
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| CN108252888A (en) * | 2017-12-29 | 2018-07-06 | 江苏大学 | A kind of photovoltaic water pump system that can increase day water yield |
| CN110032063A (en) * | 2019-04-29 | 2019-07-19 | 重庆交通大学 | PID experiment porch and its application based on differential pressure transmitter |
| CN110045758A (en) * | 2019-05-28 | 2019-07-23 | 核工业理化工程研究院 | A kind of constant current amount control method |
| CN110661017A (en) * | 2019-09-30 | 2020-01-07 | 潍柴动力股份有限公司 | Battery water pump control method, battery controller and battery |
| CN110703818A (en) * | 2019-10-28 | 2020-01-17 | 中国水利水电科学研究院 | Unsteady flow control system of hydropower station downstream model test |
| CN111398563A (en) * | 2020-04-10 | 2020-07-10 | 中国地质调查局水文地质环境地质调查中心 | Water pumping test groundwater water level flow regulating device |
| CN114931785A (en) * | 2022-06-15 | 2022-08-23 | 江西江岳环保科技有限公司 | Method for stabilizing treatment capacity of fluid filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111398563A (en) * | 2020-04-10 | 2020-07-10 | 中国地质调查局水文地质环境地质调查中心 | Water pumping test groundwater water level flow regulating device |
| CN114931785A (en) * | 2022-06-15 | 2022-08-23 | 江西江岳环保科技有限公司 | Method for stabilizing treatment capacity of fluid filter |
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Application publication date: 20140820 |