CN112197988A - Testing device and testing method for muddy water in drip irrigation annular field pipe network - Google Patents
Testing device and testing method for muddy water in drip irrigation annular field pipe network Download PDFInfo
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- CN112197988A CN112197988A CN202011040251.4A CN202011040251A CN112197988A CN 112197988 A CN112197988 A CN 112197988A CN 202011040251 A CN202011040251 A CN 202011040251A CN 112197988 A CN112197988 A CN 112197988A
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Abstract
The invention discloses a drip irrigation annular field pipe network muddy water testing device which comprises a water supply barrel, wherein a stirrer is installed in the water supply barrel; the other end of the L-shaped pipe is provided with an inverted U-shaped pipe a, one end of the inverted U-shaped pipe a is positioned at the top of the water supply barrel, the other end of the L-shaped pipe is connected with an opening-shaped pipe, the lower pipe section of the opening-shaped pipe is sequentially and oppositely provided with at least two electromagnetic flow meters, a turbidity sensor and a pressure sensor, the lower pipe section of the opening-shaped pipe is provided with an inverted U-shaped pipe b, the top of the inverted U-shaped pipe b is provided with one end of an inverted U-shaped pipe c, the other end of the inverted U-shaped pipe b is positioned at the top of the recovery barrel, the upper pipe section of the opening-shaped pipe is led out to form a 7-. The problems that muddy water testing is difficult and water flow is difficult to reverse when a long annular field pipe network is laid are solved.
Description
Technical Field
The invention relates to the technical field of field drip irrigation, in particular to a test device for muddy water of a drip irrigation annular field pipe network and a test method for muddy water of the drip irrigation annular field pipe network.
Background
In recent years, with the rapid development of drip irrigation technology, the drip irrigation area around the world is gradually expanding. The drip irrigation tree-shaped field pipe network of the drip irrigation pipe one-way water flow technology is the most common drip irrigation field pipe network arrangement form at present; the drip irrigation annular field pipe network adopting the drip irrigation pipe reversing water flow technology can realize the change of the flow direction, the flow speed, the pressure and the flow of the drip irrigation pipe in the space-time distribution, achieves the effects of improving the flow speed of the capillary section in the low-flow-speed interval and increasing the inlet pressure of the irrigator in the low-pressure interval, can flush the sediments in the capillary and break the floccules in the flow channel of the irrigator, improves the anti-blocking performance of the field pipe network, and has higher application value.
At present, the irrigation quality of a drip irrigation tree-shaped field pipe network based on a drip irrigation pipe one-way water flow technology, the irrigation ring-shaped field pipe network based on a drip irrigation pipe reversing water flow technology and the silt prevention and anti-blocking performance of the drip irrigation pipe are all tested to face a plurality of problems, for example, the laying area of a drip irrigation pipe network system in a farmland is large, the required test floor area is large, the cost for purchasing pipe network materials is high, the manpower consumption is high, the flow monitoring of an irrigator is difficult, and if the drip irrigation pipe is blocked, the crop water shortage can be caused. When the irrigation quality of a drip irrigation field pipe network and the anti-silting and anti-blocking performance of a drip irrigation pipe are subjected to simulation test in a laboratory or an open-air test field, the existing drip irrigation field pipe network testing device can only test the tree-shaped field pipe network with smaller floor area and shorter laying length of the drip irrigation pipe, and can not test the drip irrigation tree-shaped or annular field pipe network with larger floor area and longer laying length of the drip irrigation pipe.
Disclosure of Invention
The invention aims to provide a muddy water testing device for a drip irrigation annular field pipe network, which solves the problems that the muddy water testing of the drip irrigation field pipe network with large floor area and long drip irrigation pipe laying time is difficult and the water flow is difficult to change in the prior art.
The invention also aims to provide a testing method for muddy water of the drip irrigation annular field pipe network, which solves the problems that the muddy water testing of the annular field pipe network with larger floor area and longer laid drip irrigation pipes is difficult and the water flow is difficult to change in the prior art.
The invention adopts a technical scheme that the drip irrigation annular field pipe network muddy water testing device comprises a water supply barrel, wherein a stirrer is arranged in the water supply barrel, a transverse pipe of an L-shaped pipe is arranged at the lower part of the side surface of the water supply barrel, and an electromagnetic valve a, a movable joint, a water pump and a filter are sequentially arranged on the L-shaped pipe;
the other end of the L-shaped pipe is provided with an inverted U-shaped pipe a, one end of the inverted U-shaped pipe a is positioned at the top of the water supply barrel, the other end of the inverted U-shaped pipe a is connected with an opening-shaped pipe, a lower pipe section of the opening-shaped pipe is provided with a multi-pipe section of the drip irrigation pipe, the lower pipe section of the opening-shaped pipe is sequentially and oppositely provided with at least two electromagnetic flow meters, a turbidity sensor and a pressure sensor, the lower pipe section is provided with an inverted U-shaped pipe b, the top of the inverted U-shaped pipe b is provided with one end of an inverted U-shaped pipe c, the other end of the inverted U-shaped pipe c is positioned at the top of the recovery barrel, the upper pipe section of the opening-shaped pipe leads out a 7-shaped pipe, the other end of the 7;
the inverted U-shaped tube a is provided with at least two electromagnetic valves, and the mouth-shaped tube and the inverted U-shaped tube b are respectively provided with at least two electromagnetic valves and two gate valves; the electromagnetic valve, the electromagnetic valve a, the electromagnetic flowmeter, the turbidity sensor and the pressure sensor are all connected with a computer.
The invention is also characterized in that:
the inverted U-shaped tube a is led out downwards to form a branch tube which is communicated with the square-shaped tube, an electromagnetic valve d is arranged on the branch tube, the branch tube is positioned on the outer side of the inverted U-shaped tube b, and the electromagnetic valve d is connected with a computer.
The water inlet end and the water outlet end of the inverted U-shaped pipe a are respectively provided with an electromagnetic valve b and an electromagnetic valve k.
The lower pipe section of the mouth-shaped pipe is sequentially provided with a gate valve c, an electromagnetic valve e, an electromagnetic valve j and a gate valve l, the electromagnetic valves e and j are positioned on the mouth-shaped pipe section between the inverted U-shaped pipe b and the inverted U-shaped pipe a, and the electromagnetic valve e is positioned on the mouth-shaped pipe section between the branch pipe and the inverted U-shaped pipe b; gate valve c and gate valve l all are close to the standpipe of mouth venturi tube.
A 7-shaped pipe is led out from one end, far away from the water supply barrel, of the lower pipe section of the mouth-shaped pipe, an electromagnetic valve m is mounted on the 7-shaped pipe, and the electromagnetic valve m is connected with a computer.
And the inverted U-shaped pipe b is sequentially provided with a gate valve f, an electromagnetic valve g, an electromagnetic valve h and a gate valve i along the circumferential direction.
The flow monitoring device comprises a water tank, at least 5 measuring cylinders are arranged on the water tank, and each measuring cylinder is over against an irrigator with multiple pipe sections of the drip irrigation pipe.
The other technical scheme adopted by the invention is a testing method of muddy water of a pipe network in a drip irrigation annular field, and the testing device of muddy water of the pipe network in the drip irrigation annular field is implemented according to the following steps:
step 6, starting the water pump, and then closing the electromagnetic valve b to change the direction of water flow in the multi-pipe section of the drip irrigation pipe;
step 11, opening electromagnetic valves g, j and k, then closing electromagnetic valves d, e and h, continuing for 3-4 hours under the irrigation working condition 2, and simultaneously adopting a computer data acquisition system to acquire data of an electromagnetic flowmeter, a turbidity sensor and a pressure sensor;
step 12, calculating the flow of each irrigator on the multiple pipe sections of the drip irrigation pipe, and the pressure, the flow and the sand content of a water sample of the inlet and the outlet of the multiple pipe sections of the drip irrigation pipe;
step 13, opening the electromagnetic valve b, and closing the water pump and the stirrer;
and 14, repeating the steps 10-13 after the interval of 16-18 h to obtain a muddy water test result of the multiple tube sections of the drip irrigation tube.
The invention has the beneficial effects that:
the testing device for muddy water of the drip irrigation annular field pipe network can simulate and test the operation condition of the drip irrigation pipe multi-pipe section at any position in the drip irrigation tree-shaped or annular field pipe network, and finally accurately estimate and evaluate the irrigation quality and the silt reducing and anti-blocking performance change of the whole drip irrigation field pipe network by simulating and testing the drip irrigation pipe multi-pipe sections at a plurality of typical positions in the field pipe network; the testing device for muddy water in the drip irrigation annular field pipe network has the advantages of small occupied space, easy data acquisition, low testing cost, less consumed human resources and less natural influence factors, and simultaneously realizes the reversing of water flow in the drip irrigation tree-shaped or annular field pipe network.
The testing method for muddy water of the drip irrigation annular field pipe network, disclosed by the invention, can be used for predicting and evaluating the change of the irrigation quality and the silt reducing and anti-blocking performance of the whole field pipe network in the operation process by performing the test on the irrigation quality and the silt reducing and anti-blocking performance of the drip irrigation pipe multi-pipe sections at a plurality of typical positions.
Drawings
FIG. 1 is a schematic view of the overall structure of the testing device for muddy water in the drip irrigation annular field pipe network of the invention;
FIG. 2 is a schematic structural view of a water supply barrel in the muddy water testing device for the drip irrigation annular field pipe network of the invention;
FIG. 3 is a schematic structural diagram of a flow monitoring device in the testing device for muddy water in the drip irrigation annular field pipe network according to the invention;
FIG. 4 is a water flow direction diagram of the drip irrigation annular field pipe network simulated by the drip irrigation annular field pipe network muddy water testing device under the irrigation working condition 1;
FIG. 5 is a water flow pattern of the drip irrigation annular field pipe network simulated by the drip irrigation annular field pipe network muddy water testing device under the irrigation working condition 2;
FIG. 6 is a graph showing the average flow rate of drippers on the multi-pipe segment of the tree-shaped field pipe network one-way water flow drip irrigation pipe and the multi-pipe segment of the annular field pipe network reversing water flow drip irrigation pipe in the drip irrigation annular field pipe network muddy water testing device;
FIG. 7 is a Cu variation graph showing the irrigation uniformity coefficient of multiple tube sections of the tree-shaped field tube network one-way water flow drip irrigation tube and multiple tube sections of the annular field tube network reversing water flow drip irrigation tube in the drip irrigation annular field tube network muddy water testing device;
FIG. 8 is a schematic view of a drip irrigation looped field piping network arrangement;
fig. 9 is a schematic view of the drip irrigation tree-shaped field pipe network arrangement.
In the figure, 1, a water supply barrel, 2, a stirrer, 3, a movable joint, 4, a water pump, 5, a filter, 6, an electromagnetic flowmeter, 7, a turbidity sensor, 8, a pressure sensor, 9, a drip irrigation pipe multi-pipe section, 13, a recovery water barrel, 14, a water tank and 15 measuring cylinders.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a drip irrigation annular field pipe network muddy water testing device which is structurally shown in figures 1 and 2 and comprises a water supply barrel 1, wherein a stirrer 2 is arranged in the water supply barrel 1, a transverse pipe of an L-shaped pipe is arranged at the lower part of the side surface of the water supply barrel 1, and an electromagnetic valve a, a movable joint 3, a water pump 4 and a filter 5 are sequentially arranged on the L-shaped pipe;
the other end of the L-shaped pipe is provided with an inverted U-shaped pipe a, one end of the inverted U-shaped pipe a is positioned at the top of the water supply barrel 1, the other end of the inverted U-shaped pipe a is connected with a mouth-shaped pipe, the lower pipe section of the mouth-shaped pipe is provided with a multi-pipe section 9 of a drip irrigation pipe, the lower pipe section of the mouth-shaped pipe is sequentially and oppositely provided with at least two electromagnetic flow meters 6, a turbidity sensor 7 and a pressure sensor 8, the lower pipe section is provided with an inverted U-shaped pipe b, the top of the inverted U-shaped pipe b is provided with one end of an inverted U-shaped pipe c, the other end of the inverted U-shaped pipe c is positioned at the top of the recovery barrel 13, the upper pipe section of the mouth-shaped pipe leads out a 7-shaped pipe, the other end of the 7-shaped pipe is positioned at;
the inverted U-shaped tube a is provided with at least two electromagnetic valves, and the mouth-shaped tube and the inverted U-shaped tube b are respectively provided with at least two electromagnetic valves and two gate valves; the electromagnetic valve, the electromagnetic valve a, the electromagnetic flowmeter 6, the turbidity sensor 7 and the pressure sensor 8 are all connected with a computer.
The water supply barrel 1 is connected with the L-shaped pipe through a water barrel external thread joint; the stirrer 2 is fixed through a stirrer vertical support, and the model of the stirrer vertical support is many times S2; the stirrer 2 is a Burley R6167G stirrer, and the stirrer 2 extends into the water supply barrel 1; two ends of the drip irrigation pipe multi-pipe section 9 are respectively connected with the mouth-shaped pipe through a 16mm PE hard pipe lock nut bypass valve; the electromagnetic flowmeter 6 is a remote transmission electromagnetic flowmeter of intelligent QTLD in the sky; the turbidity sensor 7 is an EIXPSY TSW-30 turbidity sensor; the pressure sensor 8 is a Tiankang PCM400 pressure sensor.
Preferably, a branch pipe is led out downwards from the inverted U-shaped pipe a and is communicated with the square-shaped pipe, an electromagnetic valve d is mounted on the branch pipe, the branch pipe is positioned outside the inverted U-shaped pipe b, and the electromagnetic valve d is connected with a computer.
Preferably, the water inlet end and the water outlet end of the inverted U-shaped tube a are respectively provided with a solenoid valve b and a solenoid valve k.
Preferably, the lower tube section of the mouth-shaped tube is sequentially provided with a gate valve c, an electromagnetic valve e, an electromagnetic valve j and a gate valve l, the electromagnetic valves e and j are positioned on the mouth-shaped tube section between the inverted U-shaped tube b and the inverted U-shaped tube a, and the electromagnetic valve e is positioned on the mouth-shaped tube section between the branch tube and the inverted U-shaped tube b; gate valve c and gate valve l all are close to the standpipe of mouth venturi tube.
Preferably, a 7-shaped pipe is led out from one end, away from the water supply barrel 1, of the lower pipe section of the mouth-shaped pipe, and an electromagnetic valve m is mounted on the 7-shaped pipe and connected with a computer.
Preferably, the inverted U-shaped tube b is sequentially provided with a gate valve f, a solenoid valve g, a solenoid valve h and a gate valve i along the circumferential direction.
Preferably, as shown in fig. 3, the flow monitoring device comprises a tank 14, at least 5 measuring cylinders being arranged on the tank 14, each measuring cylinder facing an emitter of the multi-tube section 9 of drip irrigation pipe.
The electromagnetic valves a, b, d, e, g, h, j, k and m are all positive Tai electromagnetic water valves 200-20; and is connected with a computer through a 16-path serial port relay.
The invention also provides a testing method for muddy water of the pipe network in the drip irrigation annular field, which is implemented by adopting the testing device for muddy water of the pipe network in the drip irrigation annular field according to the following steps:
step 6, starting the water pump 4, and then closing the electromagnetic valve b to change the direction of water flow in the multiple pipe sections 9 of the drip irrigation pipe;
step 11, opening electromagnetic valves g, j and k, then closing electromagnetic valves d, e and h, continuing for 3-4 hours under the irrigation working condition 2, and simultaneously adopting a computer data acquisition system to acquire data of an electromagnetic flowmeter 6, a turbidity sensor 7 and a pressure sensor 8; as shown in fig. 5;
step 12, calculating the flow of each irrigator on the multi-pipe section 9 of the drip irrigation pipe, and the pressure, the flow and the sand content of a water sample of the inlet and the outlet of the multi-pipe section 9 of the drip irrigation pipe;
step 13, opening the electromagnetic valve b, and closing the water pump 4 and the stirrer 2;
and 14, repeating the steps 10-13 after the interval of 16-18 h to obtain a muddy water test result of the multiple tube sections of the drip irrigation tube.
Wherein, the sand content of the water sample is measured by a turbidity sensor 7.
Irrigate cyclic annular field pipe network of driping irrigation that operating mode 1 and irrigation operating mode 2 are suitable for and include the trunk pipe, the trunk pipe is provided with first branch pipe and the second branch pipe that is parallel to each other perpendicularly, be provided with the capillary of driping irrigation of a plurality of mutual parallelism between first branch pipe and the second branch pipe perpendicularly, it is parallel to the trunk pipe to drip irrigation the capillary, every is driped irrigation the capillary and is provided with a plurality of and drips irrigation the emitter, first water intaking valve is installed to the one end that first branch pipe is close to the trunk pipe, first drain valve is installed to the other end of first branch pipe, the second water intaking valve is installed to the one end that the second branch pipe is close to the trunk pipe. The drip irrigation pipe multi-pipe section 9 has the same structure as any section of drip irrigation capillary pipe of the annular field pipe network.
The irrigation working condition 1 is as follows: opening a first water inlet valve, closing a second water inlet valve, a first water discharge valve and a second water discharge valve, enabling irrigation water flow to enter a first branch pipe from a main pipe and then flow into each capillary, enabling the water flow in each capillary to flow from left to right, and finally discharging the irrigation water from an irrigator;
the irrigation working condition 2 is as follows: and opening a second water inlet valve, closing the first water inlet valve, the first water discharge valve and the second water discharge valve, enabling irrigation water flow to enter the second branch pipe from the main pipe and then flow into each capillary, enabling the water flow in each capillary to flow from right to left, and finally discharging the irrigation water from the irrigator.
The flushing working condition 1 is as follows: opening a first water inlet valve and a second water discharge valve, closing the second water inlet valve and the first water discharge valve, enabling flushing water flow to enter a first branch pipe from a main pipe and then flow into each capillary, enabling the water flow in each capillary to flow from left to right, and finally discharging the flushing water flow from an irrigator and the second water discharge valve;
the flushing working condition 2 is as follows: and opening a second water inlet valve and a first water discharge valve, closing the first water inlet valve and the second water discharge valve, enabling flushing water flow to enter the second branch pipe from the main pipe and then flow into each capillary, enabling the water flow in each capillary to flow from right to left, and finally discharging the flushing water from the irrigator and the first water discharge valve.
The invention also relates to a test method of the tree-shaped field pipe network drip irrigation pipe, which adopts the drip irrigation annular field pipe network muddy water test device and is implemented according to the following steps:
step 6, closing the electromagnetic valve a, unscrewing the movable joint 3, separating the water supply barrel 1 from the water pump 4, pouring out the residual clear water in the water supply barrel 1, adding a muddy water sample to be tested into the water supply barrel 1, screwing the movable joint 3, and opening the electromagnetic valve a;
and 10, repeating the steps 7-9 after the interval of 16-18 h to obtain a muddy water test result of the multiple tube sections of the drip irrigation tube.
The drip irrigation tree-shaped field pipe network comprises a main pipe, a branch pipe is vertically arranged in the middle of the main pipe, a plurality of drip irrigation capillary pipes which are parallel to each other are vertically arranged on the branch pipe, the drip irrigation capillary pipes are parallel to the main pipe, each drip irrigation capillary pipe is provided with a plurality of drip irrigation douches, two ends of each drip irrigation capillary pipe are respectively provided with a drain valve, one end of the branch pipe, which is close to the main pipe, is provided with a water inlet valve, and the water inlet valves are positioned on the branch pipe between the drip. The multi-pipe section 9 of the drip irrigation pipe has the same structure as any section of the drip irrigation capillary pipe of the tree-shaped field pipe network.
The irrigation working condition is as follows: opening a water inlet valve at the inlet of the branch pipe, closing a water discharge valve at the end part of each drip irrigation capillary, and discharging irrigation water flow from the main pipe to the branch pipe, then to each drip irrigation capillary and finally to an irrigation emitter;
the flushing working condition is as follows: and opening a water inlet valve at the inlet of the branch pipe and a water discharge valve at the end part of the drip irrigation capillary, wherein the irrigation water flow firstly enters the branch pipe from the main pipe, then flows into each drip irrigation capillary, and finally is discharged from the irrigation emitter and the discharge valve. Test verification:
in order to verify the feasibility and the effectiveness of the drip irrigation annular field pipe network muddy water testing device, a section of drip irrigation pipe multi-pipe section 9 is respectively cut from the corresponding positions of the drip irrigation tree-shaped field pipe network and the drip irrigation annular field pipe network to carry out irrigation quality and silt prevention and anti-blocking performance testing.
Acquiring the average flow, the irrigation uniformity, the flow of the capillary tube sections and the flow velocity value of the capillary tube sections of the drip irrigation tree-shaped pipe network unidirectional water flow drip irrigation multi-pipe sections and the annular pipe network reversing water flow drip irrigation multi-pipe sections; the irrigation quality and the anti-blocking performance of the annular field pipe network reversing water flow drip irrigation pipe multi-pipe section and the tree-shaped pipe network one-way water flow drip irrigation multi-pipe section under different irrigation working conditions are contrastively analyzed, and meanwhile, the flushing effect under different flushing working conditions is contrastively analyzed.
And 2 drip irrigation pipe sections with the length of 12m are selected for testing, one drip irrigation pipe section is used for carrying out a one-way water flow muddy water test, and the other drip irrigation pipe section is used for carrying out a reversing water flow muddy water test. Firstly, performing 20 times of multi-pipe-section muddy water irrigation tests, and analyzing the irrigation quality and anti-blocking performance of 2 multi-pipe sections; and after 20 times of muddy water irrigation tests are finished, performing 1 time of multi-pipe section flushing test, and analyzing the flushing effect of 2 multi-pipe sections.
The distance between the drippers on the drip irrigation belt is 30cm, 39 drippers are arranged on each drip irrigation capillary, the flow of each dripper is measured by using a measuring cylinder 15 in the test process, and the sand content of the water discharged from the tail end of the multi-pipe section 9 of the drip irrigation pipe and the sand content of the water discharged from the drippers are measured by using a turbidity sensor 7. Through a clean water test, when the pressure is 100kPa, the flow rate of the dripper is 3.5L/h. The silt content of the muddy water in the test is 10 g/L. The drip irrigation water first passes through a screen filter, and the test soil for preparing muddy water is naturally air-dried and ground, and then passes through a 120-mesh screen (the aperture is 0.125 mm).
According to calculation, a one-way water flow multi-pipe section AB (shown in figure 9) cut out from a drip irrigation tree-shaped field pipe network has the water inlet pressure of 100.4kPa and the water outlet flow of 35.07L/h under the irrigation working condition, and has the water inlet pressure of 110.4kPa and the water outlet flow of 235.07L/h under the flushing working condition;
the reversing water flow multi-pipe section EF (shown in figure 8) cut out from the drip irrigation annular field pipe network has the water inlet pressure of 118.6kPa and the water outlet flow of 525.23L/h under the irrigation working condition 1, the water inlet pressure of 100.4kPa and the water outlet flow of 35.07L/h under the irrigation working condition 2, the water inlet pressure of 128.6kPa and the water outlet flow of 725.23L/h under the flushing working condition 1, the water inlet pressure of 110.4kPa and the water outlet flow of 235.07L/h under the flushing working condition 2.
The average value of the flow of the 39 drippers on the drip irrigation annular field pipe network multi-pipe section and the drip irrigation tree-shaped pipe network multi-pipe section is respectively calculated in each test, and the average value is used as the test result, and the irrigation uniformity coefficient Cu of the drippers on the 2 multi-pipe sections is simultaneously calculated. The average flow of the drippers is calculated by using a formula (1), the irrigation uniformity coefficient Cu of the drippers is calculated by using a formula (2), and specific calculation results are shown in a table 1.
Wherein the content of the first and second substances,
representing the average flow of drippers on the multi-pipe section;
qithe dripper flow monitoring value with the number i is represented;
n represents the number of drippers on the multi-pipe section, and 39 drippers are arranged on each multi-pipe section in the test.
Wherein Cu represents a Kelissen uniformity coefficient;
qithe dripper flow monitoring value with the number i is represented;
n represents the number of drippers on the multi-pipe section, and 39 drippers are arranged on each multi-pipe section in the test.
TABLE 1 average value of multi-segment dripper flow and irrigation uniformity coefficient Cu
(1) As can be seen from table 1, after 20 times of the muddy water irrigation test, the average dripper flow and the uniform irrigation coefficient Cu of the multi-pipe segment of the tree field pipe network unidirectional water flow drip irrigation pipe and the annular field pipe network reversing water flow drip irrigation pipe are reduced to different degrees, after 1 time of flushing of 2 multi-pipe segments, the average dripper flow and the uniform irrigation coefficient Cu of the annular field pipe network reversing water flow multi-pipe segment are restored to higher levels (Cu is not less than 95%, and the relative average flow is not less than 95%), and the average dripper flow and the uniform irrigation coefficient Cu of the tree field pipe network unidirectional water flow multi-pipe segment are not restored to higher levels.
(2) FIG. 6 is a graph showing the average flow rate of drippers on the multi-pipe segment of the tree-shaped field pipe network unidirectional water flow drip irrigation pipe and the multi-pipe segment of the annular field pipe network reversing water flow drip irrigation pipe in the 20 muddy water test processes. As can be seen from fig. 6, many drippers on the one-way water flow multi-pipe section of the tree-shaped field pipe network are blocked in the 16 th test, the average flow is greatly reduced, and as the test continues, some drippers are blocked continuously, until the 20 th test is finished, most of the drippers on the tree-shaped field pipe network capillary are blocked, the average flow is reduced to 58.7% of the initial flow, the flow reduction range is large, and the irrigation requirement cannot be met; after 20 times of muddy water tests, the average flow of the drippers on the multi-pipe section of the reversing water flow of the annular field pipe network is reduced to 3.45L/h, which is 95.3 percent of the initial flow, the flow reduction range is small, and the irrigation requirement can still be met.
(3) FIG. 7 is a graph showing Cu variation of the irrigation uniformity coefficient of the multi-tube sections of the tree-shaped field pipe network one-way water flow drip irrigation tube and the annular field pipe network reversing water flow drip irrigation tube in the 20 muddy water test processes. As can be seen from fig. 7, in the whole testing process, many drippers on the multi-pipe segment of the one-way water flow of the tree-shaped field pipe network are blocked in the 18 th testing process, so that the uniformity coefficient of the multi-pipe segment is greatly reduced to 89%, and the irrigation uniformity of the multi-pipe segment of the whole tree-shaped field pipe network cannot meet the irrigation requirement; after 20 times of muddy water test tests on the annular field pipe network multi-pipe section are finished, the uniformity coefficient is kept at 95%, the irrigation requirement can still be met, and the washing effect of the reversing water flow is better than that of the one-way water flow.
Compared with the tree field pipe network one-way water flow drip irrigation pipe multi-pipe section, the annular field pipe network reversing water flow drip irrigation pipe multi-pipe section has the advantages that the flow of the drippers is stable, the flow reduction amplitude is small, the condition that the drippers are blocked is less, the irrigation uniformity coefficient is high, and the irrigation quality and the silt reducing and anti-blocking performance are good. The muddy water test device for the drip irrigation annular field pipe network can be used for completing muddy water test tests on the irrigation quality and the silt reducing and anti-blocking performance of multiple pipe sections of the drip irrigation pipe network of the field pipe network, and the feasibility and the effectiveness of the muddy water test device are proved.
Claims (8)
1. The drip irrigation annular field pipe network muddy water testing device is characterized by comprising a water supply barrel (1), wherein a stirrer (2) is installed in the water supply barrel (1), a transverse pipe of an L-shaped pipe is installed at the lower part of the side surface of the water supply barrel (1), and an electromagnetic valve a, a movable joint (3), a water pump (4) and a filter (5) are sequentially installed on the L-shaped pipe;
the other end of the L-shaped pipe is provided with an inverted U-shaped pipe a, one end of the inverted U-shaped pipe a is positioned at the top of the water supply barrel (1), the other end of the inverted U-shaped pipe is connected with an opening-shaped pipe, a lower pipe section of the opening-shaped pipe is provided with a multi-pipe section (9) of a drip irrigation pipe, the lower pipe section of the opening-shaped pipe is sequentially and oppositely provided with at least two electromagnetic flow meters (6), a turbidity sensor (7) and a pressure sensor (8), the lower pipe section is provided with an inverted U-shaped pipe b, the top of the inverted U-shaped pipe b is provided with one end of an inverted U-shaped pipe c, the other end of the inverted U-shaped pipe c is positioned at the top of the recovery barrel (13), the upper pipe section of the opening-shaped pipe is led out with a 7-shaped pipe, the other end of the 7-shaped pipe is positioned at the top of the recovery barrel (, a flow monitoring device is arranged below the multiple pipe sections (9) of the drip irrigation pipe;
the inverted U-shaped tube a is provided with at least two electromagnetic valves, and the mouth-shaped tube and the inverted U-shaped tube b are respectively provided with at least two electromagnetic valves and two gate valves; the electromagnetic valve, the electromagnetic valve a, the electromagnetic flowmeter (6), the turbidity sensor (7) and the pressure sensor (8) are all connected with a computer.
2. The device for testing muddy water in a drip irrigation annular field pipe network according to claim 1, wherein a branch pipe is led downwards from the inverted U-shaped pipe a and is communicated with the square-shaped pipe, an electromagnetic valve d is mounted on the branch pipe, the branch pipe is positioned outside the inverted U-shaped pipe b, and the electromagnetic valve d is connected with a computer.
3. The device for testing muddy water in a drip irrigation annular field pipe network according to claim 2, wherein the water inlet end and the water outlet end of the inverted U-shaped pipe a are respectively provided with an electromagnetic valve b and an electromagnetic valve k.
4. The device for testing muddy water in a drip irrigation annular field pipe network according to claim 3, wherein the lower pipe section of the mouth-shaped pipe is sequentially provided with a gate valve c, a solenoid valve e, a solenoid valve j and a gate valve l, the solenoid valves e and j are positioned on the mouth-shaped pipe section between the inverted U-shaped pipe b and the inverted U-shaped pipe a, and the solenoid valve e is positioned on the mouth-shaped pipe section between the branch pipe and the inverted U-shaped pipe b; and the gate valve c and the gate valve l are both close to the vertical pipe of the mouth-shaped pipe.
5. The device for testing muddy water in the pipe network of the drip irrigation annular field according to claim 4, wherein a 7-shaped pipe is led out from one end, away from the water supply barrel (1), of the lower pipe section of the mouth-shaped pipe, and an electromagnetic valve m is mounted on the 7-shaped pipe and connected with a computer.
6. The device for testing muddy water in a drip irrigation annular field pipe network according to claim 5, wherein the inverted U-shaped pipe b is provided with a gate valve f, a solenoid valve g, a solenoid valve h and a gate valve i in sequence along the circumferential direction.
7. The muddy water testing device for the drip irrigation annular field pipe network according to claim 6, wherein the flow monitoring equipment comprises a water tank (14), at least 5 measuring cylinders are arranged on the water tank (14), and each measuring cylinder is opposite to an emitter of the multiple pipe sections (9) of the drip irrigation pipe.
8. The testing method for muddy water of the drip irrigation annular field pipe network is characterized in that the testing device for muddy water of the drip irrigation annular field pipe network according to claim 7 is adopted and is implemented according to the following steps:
step 1, respectively measuring water inlet pressure P of annular field pipe network drip irrigation pipe under irrigation working condition 1 and irrigation working condition 21、P2And outlet flow rate Q1、Q2(ii) a The multiple pipe sections (9) of the drip irrigation pipe intercepted on the annular field pipe network are arranged on a muddy water testing device of the drip irrigation annular field pipe network;
step 2, adding clean water into the water supply barrel (1), then opening the electromagnetic valves a, b, d, e and h, opening the gate valves c and i to the maximum opening degree, and closing the rest gate valves and the electromagnetic valves;
step 3, opening a water pump (4), and closing an electromagnetic valve b to enable water flow in the drip irrigation annular field pipe network muddy water testing device to pass through a drip irrigation pipe multi-pipe section (9);
step 4, adjusting the opening degree of the gate valves c and i to enable the monitoring value of the pressure sensor (8) and the water inlet pressure P under the irrigation working condition 11The same, and the monitoring value of the electromagnetic flowmeter (6) far away from the water supply barrel (1) and the water outlet flow Q under the irrigation working condition 11The same;
step 5, closing the water pump (4) and the electromagnetic valves d, e and h, keeping the opening degrees of the gate valves c and i unchanged, opening the electromagnetic valves b, g, j and k, and opening the gate valves f and l to the maximum opening degrees;
step 6, starting the water pump (4), and then closing the electromagnetic valve b to change the direction of water flow in the multi-pipe section (9) of the drip irrigation pipe;
step 7, adjusting the opening degree of the gate valves f and l to enable the monitoring value of the pressure sensor (8) far away from the water supply barrel (1) and the water inlet pressure P under the irrigation working condition 22The same, and the monitoring value of the electromagnetic flowmeter (6) and the water outlet flow Q under the irrigation working condition 22The same;
step 8, opening the electromagnetic valve b, closing the water pump (4), and then closing the electromagnetic valves a, g, j and k to finish debugging;
step 9, unscrewing the movable joint (3), separating the water supply barrel (1) from the water pump (4), pouring out the residual clear water in the water supply barrel (1), adding a muddy water sample to be tested into the water supply barrel (1), screwing the movable joint (3) tightly, and opening the gate valve a;
step 10, opening electromagnetic valves d, e and h, opening a stirrer (2) and a water pump (4), closing an electromagnetic valve b, continuing for 3-4 hours under the irrigation working condition 1, and simultaneously adopting a computer data acquisition system to acquire data of an electromagnetic flowmeter (6), a turbidity sensor (7) and a pressure sensor (8);
step 11, opening electromagnetic valves g, j and k, then closing electromagnetic valves d, e and h, continuing for 3-4 hours under the irrigation working condition 2, and simultaneously adopting a computer data acquisition system to acquire data of an electromagnetic flowmeter (6), a turbidity sensor (7) and a pressure sensor (8);
step 12, calculating the flow of each irrigator on the multiple pipe sections (9) of the drip irrigation pipe, and the pressure, the flow and the sand content of a water sample of the inlet and the outlet of the multiple pipe sections (9) of the drip irrigation pipe;
step 13, opening the electromagnetic valve b, and closing the water pump (4) and the stirrer (2);
and 14, repeating the steps 10-13 after the interval of 16-18 h to obtain a muddy water test result of the multiple tube sections of the drip irrigation tube.
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| CN202011040251.4A CN112197988A (en) | 2020-09-28 | 2020-09-28 | Testing device and testing method for muddy water in drip irrigation annular field pipe network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115428640A (en) * | 2022-10-20 | 2022-12-06 | 甘肃省农业科学院土壤肥料与节水农业研究所 | Fertile system is annotated in portable pressure boost |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115428640A (en) * | 2022-10-20 | 2022-12-06 | 甘肃省农业科学院土壤肥料与节水农业研究所 | Fertile system is annotated in portable pressure boost |
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