CN111380673A - Self-pressure air suction oxygenation water discharge pipe performance testing equipment and method and parameter optimization method - Google Patents
Self-pressure air suction oxygenation water discharge pipe performance testing equipment and method and parameter optimization method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 335
- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000005457 optimization Methods 0.000 title claims abstract description 21
- 230000001965 increasing effect Effects 0.000 claims abstract description 107
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000001301 oxygen Substances 0.000 claims abstract description 106
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 106
- 238000011056 performance test Methods 0.000 claims abstract description 52
- 230000008602 contraction Effects 0.000 claims description 50
- 238000005273 aeration Methods 0.000 claims description 37
- 239000007789 gas Substances 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 14
- 210000001503 joint Anatomy 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims 2
- 238000013461 design Methods 0.000 abstract description 6
- 238000010998 test method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 230000002262 irrigation Effects 0.000 description 5
- 238000003973 irrigation Methods 0.000 description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009313 farming Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000003621 irrigation water Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a performance test device for a self-pressure air suction oxygenation drain pipe, which comprises a submersible pump arranged in water, a variable frequency power supply with adjustable output power, a valve with adjustable opening degree, an air flow meter, a pipeline flow meter and a pipeline pressure meter, wherein the devices are connected by pipelines and communicated with a water pool to form a closed loop. The invention can detect the air suction volume and the oxygen increasing effect of any type of self-pressure air suction oxygen increasing water drain pipe under the specified working pressure, and provides a solution for the design of the setting of the oxygen increasing water drain pipe and the performance detection of the oxygen increasing water drain pipe. The invention also provides a test method for testing the air suction and oxygen increasing effects of the self-pressure air suction and oxygen increasing water drain pipe by using the performance test equipment and a parameter optimization method for optimizing the structural size parameters of the oxygen increasing water drain pipe by using the test method.
Description
Technical Field
The invention relates to the technical field of modern agriculture, in particular to a performance test device and a test method of a self-pressure air suction oxygenation drain pipe capable of increasing oxygen content in irrigation water supply or aquaculture water supply.
Background
The Chinese patent application with the application number of 201610823146.5 discloses a self-pressure air suction oxygenation water discharge pipe, which comprises a water inlet section 2, a bell mouth contraction section 3, a throat pipe 4, an aeration oxygenation section 10 and an elbow 9, wherein the elbow 9 is connected to the tail end of the aeration oxygenation section 10, and the upper part of one end, close to the elbow 3, of the throat pipe 4 is provided with an air suction cavity 7 with an arc-shaped longitudinal section; the cross-sectional area outside-in of chamber 7 of breathing in reduces gradually, and the opening of chamber 7 bottom of breathing in is towards spout 10 one side, and a intake pipe 6 is connected on chamber 7 upper portion of breathing in, elbow 9 internal fixation has 8 tremblers to cut open, and under the water impact, 8 tremblers of production high frequency vibration smash the air bubble, form the micro-bubble and dissolve in the water, realize the oxygenation. The self-pressure air-suction oxygen-increasing water drain pipe can stably and continuously increase the oxygen content in water.
In the process of the applicant's in-depth research for changing the invention patent into an application product, the applicant finds that because the structure of the water discharge pipe is more special and novel, no performance test equipment and test method which are suitable for the structure of the water discharge pipe exist in the market; in addition, in order to master the influence relationship between the structural size parameters of the key part of the water drain pipe and the air suction oxygenation effect and provide a basis for the design of the shaping of the oxygenation water drain pipe, an air suction oxygenation performance test needs to be carried out on oxygenation pipe prototypes with different structural parameters so as to optimize the structural size parameters of the oxygenation water drain pipe according to the test result; meanwhile, the air suction and oxygen increasing performance of the oxygen increasing and water discharging pipe products manufactured in batches also need to be sampled and detected so as to check the product delivery quality. Therefore, a performance testing device and a testing method specially used for the water discharge pipe are urgently needed to be developed.
Disclosure of Invention
The invention aims to solve the problems that: aiming at the problems which need to be solved by the design of the self-pressure air suction oxygen increasing water drain pipe in the background technology and the inspection of the product quality and the performance, the performance test equipment and the test method of the self-pressure air suction oxygen increasing water drain pipe are provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a performance test device for a self-pressure air suction oxygenation drain pipe comprises a submersible pump, a variable frequency power supply, a valve with adjustable opening degree, a first pipeline and a second pipeline; the output end of the variable frequency power supply is connected with the submersible pump; one end of the second pipeline is connected with the outlet of the valve, and the other end of the second pipeline is used for being connected with a water inlet section of the self-pressure air-suction oxygen-increasing water drain pipe to be tested; the performance test equipment further comprises a water flowmeter for measuring the inflow of the water inlet section of the measured self-pressure air suction oxygenation drain pipe, a gas flowmeter for measuring the air suction flow of the air inlet pipe of the measured self-pressure air suction oxygenation drain pipe, a first pressure gauge for measuring the water flow pressure in the first pipeline and a second pressure gauge for measuring the water flow pressure in the second pipeline.
In this application, utilize the water flowmeter to measure the section of intaking inflow, utilize the gas flowmeter to measure the intake pipe flow of breathing in, utilize first manometer to measure the interior rivers pressure of first pipeline to can all realize the control to the flow of intaking, the flow of breathing in, thereby be convenient for test oxygenation bleeder line performance. Through setting up first manometer to can measure the rivers pressure that the immersible pump provided. Utilize variable frequency power supply can control the immersible pump to adjust the pressure and the discharge of rivers in the first pipeline, thereby realize inhaling oxygenation bleeder line water inlet pipe water inlet section inflow flow, the pressure of intaking to the autogenous pressure and control. The applicant finds that when the oxygen increasing drain pipe provided by the invention is tested, the air suction flow of the oxygen increasing drain pipe within a certain water flow range or a certain water flow pressure range is required to be tested, and if the water inlet flow range and the water inlet pressure range of the oxygen increasing drain pipe are changed by frequently adjusting the pressure or the flow of the water flow discharged by the submersible pump through the variable frequency power supply, the submersible pump is easily damaged. In the invention, the valve with the adjustable opening degree is arranged between the submersible pump and the oxygen increasing drain pipe, after the output power of the variable frequency power supply is adjusted, the output power is not required to be adjusted, and the flow rate or the flow pressure of the water in the second pipeline can be changed only by adjusting the opening degree of the valve, so that the water inlet flow rate range and the water inlet pressure range of the oxygen increasing drain pipe can be changed.
Further, an air inlet of the gas flow meter is connected with the outside air, and an air outlet of the gas flow meter is in butt joint with an air suction port of the air inlet pipe.
Further, the gas flow meter is a mechanical gas meter.
The applicant finds that the electronic air flow meter or the heat-sensitive air flow meter is easily interfered by water vapor and cannot accurately measure the air suction flow because the working environment of the oxygen increasing and water discharging pipe is rich in water vapor during testing. Through adopting mechanical type gas table for the gas table is difficult for receiving the operational environment's that is rich in steam influence, thereby can realize the accurate measurement of air intake, guarantees the security of equipment moreover.
Further, the immersible pump sets up in the retaining facility, the elbow export sets up towards the retaining facility opening.
Through the arrangement, the water flow flowing into the oxygen increasing water drain pipe from the water storage facility returns to the water storage facility, so that the water is recycled, and the water resource waste caused in the test process can be reduced or avoided.
Furthermore, the inlet water flow of the tested self-pressure air-suction oxygen-increasing water drain pipe is taken from the water storage facility, the outlet water flow of the tested self-pressure air-suction oxygen-increasing water drain pipe is discharged into the water storage facility, and the inlet, the outlet and the water storage facility form a closed loop, so that the water required by the test is ensured to be continuous, and the water resource is not consumed. The inlet water flow of the tested self-pressure air-suction oxygen-increasing water drain pipe is the inlet water flow of the water inlet section, and the outlet water flow of the tested self-pressure air-suction oxygen-increasing water drain pipe is the outlet water flow of the elbow.
The invention also provides a performance test method of the self-pressure air-suction oxygen-increasing water drain pipe by using the performance test equipment of the self-pressure air-suction oxygen-increasing water drain pipe, which takes the air suction flow measured by the air flow meter when the self-pressure air-suction oxygen-increasing water drain pipe runs as a main index for evaluating the performance of the self-pressure air-suction oxygen-increasing water drain pipe.
The invention also provides a performance test method of the self-pressure air-suction oxygen-increasing water drain pipe by utilizing the performance test equipment of the self-pressure air-suction oxygen-increasing water drain pipe, which comprises the following steps:
(A) starting the variable frequency power supply, starting the submersible pump, closing the valve, and adjusting the variable frequency power supply to enable the measured value of the first pressure gauge to be a set pressure value;
(B) the air outlet of the air flow meter is butted with the air suction port of the air inlet pipe of the self-pressure air suction oxygenation drain pipe to be detected, and the other end of the second pipeline is butted with the water inlet of the water inlet section of the self-pressure air suction oxygenation drain pipe to be detected;
(C) the valve is opened, the opening of the valve is adjusted, the second pressure gauge is used for measuring the water flow pressure in the second pipeline, the water flow meter is used for measuring the water inlet flow of the water inlet section of the measured self-pressure air suction oxygenation drain pipe, the gas flow meter is used for measuring the air suction flow of the air inlet pipe of the measured self-pressure air suction oxygenation drain pipe, and therefore the air suction flow of the air inlet pipe of the self-pressure air suction oxygenation drain pipe is tested and set when the water flow pressure or the set water inlet flow working condition corresponds to the set water flow working condition.
By utilizing the performance test method, the invention can detect the air suction volume and the oxygen increasing effect of the self-pressure air suction and oxygen increasing water drain pipes of various types (pipe diameters) under any working pressure, and provides a solution for the design of the setting of the oxygen increasing water drain pipes and the performance detection of the oxygen increasing water drain pipes.
The invention also provides a method for optimizing the structural size parameters of the self-pressure air suction oxygen increasing water drain pipe, which comprises the steps of defining a first length L1 as the length of a bell mouth contraction section in the length direction of the self-pressure air suction oxygen increasing water drain pipe, defining a second length L2 as the length of an air entrainment oxygen increasing section in the length direction of the self-pressure air suction oxygen increasing water drain pipe, defining the length of the air entrainment oxygen increasing section as the distance between one end, far away from a water inlet section, of an opening at the bottom of an air suction cavity and the water inlet section, close to a vibrating piece, and defining a contraction ratio D ═ D2/D1, wherein a first inner diameter D1 is the inner diameter of the water inlet section, and a second inner diameter D2 is the inner diameter of a throat pipe, wherein the method for optimizing the parameters of the self-pressure air suction oxygen increasing water drain pipe comprises an optimizing sub-method of;
the optimization sub-method of the first length L1 comprises: firstly, adopting N1 tested self-pressure air suction and oxygen increasing water discharge pipes with different first lengths L1 and N1 tested self-pressure air suction and oxygen increasing water discharge pipes with the same other structural size parameters, and executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipes; then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-suction oxygen-increasing drain pipe for the N1 tested self-pressure air-suction oxygen-increasing drain pipes, and keeping the measured value of the second pressure gauge in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing drain pipe to obtain the air suction flow of the air inlet pipe of each tested self-pressure air-suction oxygen-increasing drain pipe; finally, determining the optimal value or the optimal range of the first length L1 according to the air suction flow of the air inlet pipe of each measured self-pressure air suction oxygenation drain pipe;
the sub-method for optimizing the contraction ratio d comprises the following steps: firstly, adopting N2 tested self-pressure air suction and oxygen increasing water discharge pipes with different contraction ratios D, and executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipe by adopting N2 tested self-pressure air suction and oxygen increasing water discharge pipes with the same structure size parameters except for the first inner diameter D1 and the second inner diameter D2; then, respectively executing the step (B) and the step (C) of the self-pressure air-suction oxygen-increasing water drain pipe performance testing method for the N2 tested self-pressure air-suction oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe and the water inlet flow of the water inlet section of each tested oxygen-increasing water drain pipe; finally, determining the optimal value or the optimal range of the contraction ratio d according to the air suction flow of the air inlet pipe and the water inlet flow of the water inlet section of each detected oxygen increasing water drain pipe;
the optimization sub-method of the second length L2 includes: firstly, adopting N3 tested self-pressure air suction and oxygen increasing water discharge pipes with different second lengths L2, and executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipes by adopting N3 tested self-pressure air suction and oxygen increasing water discharge pipes with the same other structural size parameters; then, respectively executing the step (B) and the step (C) of the self-pressure air-suction oxygen-increasing water drain pipe performance test method for the N3 tested self-pressure air-suction oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe of each tested oxygen-increasing water drain pipe; and finally, determining the optimal value or the optimal range of the second length L2 according to the air suction flow of the air inlet pipe of each detected oxygen increasing and water discharging pipe.
According to the parameter optimization method of the self-pressure air-suction oxygen-increasing water drain pipe, the optimal range or the optimal value of the parameters of the contraction ratio D, the first inner diameter D1 and the second inner diameter D2 can be determined according to the water inlet flow of the water inlet section and the air suction flow of the air inlet pipe, so that the oxygen-increasing water drain pipe can be set by using the selected optimal range or the selected optimal value of the parameters, and the oxygen-increasing water drain pipe with high performance can be obtained.
The applicant finds that the field water diversion port of the pipeline irrigation area in the field has several common standard pipe diameters, the first inner diameter D1 is the same as the standard pipe diameter, and more intermediate connection conversion devices can be avoided, so that the cost is saved, and the complexity of the device is reduced. Therefore, in a preferred mode, when the value of the contraction ratio D is adjusted, the value of the first inner diameter D1 is a fixed value, and the structural and dimensional parameters of the oxygen increasing discharge pipe except the second inner diameter D2 are kept unchanged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a performance testing device of a self-pressure air suction and oxygen increasing water discharge pipe in an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a conventional self-pressure air-suction oxygen-increasing water discharge pipe.
In the attached drawings, 1, a screw, 2, a water inlet section, 3, a bell-mouth contraction section, 4, a throat pipe, 5, a cover, 6, an air inlet pipe, 7, an air suction cavity, 8, a vibrating plate, 9, an elbow, 10, an aeration oxygenation section, 20, a submersible pump, 201, a water pump variable frequency power supply, 50, a valve, 80, a water flowmeter, 90, a gas flowmeter, 70, a first pressure gauge, 40, a second pressure gauge, 60, a first pipeline, 30, a second pipeline, 100, a self-pressure air suction oxygenation drainage pipe, 200 and a water storage facility.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1: self-pressure air suction oxygenation water drain pipe performance test equipment
As shown in fig. 1, the self-pressure air-suction oxygen-increasing water discharge pipe performance test device comprises a submersible pump 20, a variable frequency power supply 201, a valve 50 with adjustable opening degree, a first pipeline 30 and a second pipeline 60; the output end of the variable frequency power supply 201 is connected with the submersible pump 20; one end of the second pipeline 60 is connected with the outlet of the valve 50, and the other end of the second pipeline is used for being connected with the water inlet of the water inlet section 2 of the self-pressure air-suction oxygen-increasing water drain pipe to be tested; the performance test equipment further comprises a water flow meter 80 for measuring the water inflow rate of the water inlet section 2 of the measured self-pressure air suction oxygenation drain pipe, a gas flow meter 90 for measuring the air suction rate of the air inlet pipe 6 of the measured self-pressure air suction oxygenation drain pipe, a first pressure meter 40 for measuring the water flow pressure in the first pipeline 30 and a second pressure meter 70 for measuring the water flow pressure in the second pipeline 60. The submersible pump 20 is disposed under water.
The inner diameters of the second pipeline 60 and the water inlet section 2 can be set to be the same, so that the water flow pressure and the water flow of the water inlet section 2 of the measured self-pressure air-breathing oxygen-increasing water drain pipe are respectively equal to the water flow pressure and the water flow in the second pipeline 60.
In a preferred embodiment, the air inlet of the gas flow meter 90 is connected to the outside air, and the air outlet of the gas flow meter 90 is in butt joint with the air inlet of the air inlet pipe 6. The gas flow meter 90 may be a mechanical gas meter.
The submersible pump 20 may be disposed in the water storage facility 200 with the outlet of the elbow 9 disposed towards the opening of the water storage facility 200. The water storage facility 200 may be a pond.
Example 2: method for testing performance of self-pressure air suction oxygenation water discharge pipe
The invention also provides a performance test method of the self-pressure air-suction oxygen-increasing water drain pipe by utilizing the performance test equipment of the self-pressure air-suction oxygen-increasing water drain pipe, which comprises the following steps:
(A) starting the variable frequency power supply 201, starting the submersible pump 20, closing the valve 50, and adjusting the variable frequency power supply 201 to enable the measured value of the first pressure gauge 40 to be a set pressure value;
(B) the air outlet of the gas flow meter 90 is butted with the air suction port 6 of the air inlet pipe 6 of the self-pressure air suction oxygenation drain pipe to be tested, and the other end of the second pipeline 60 is butted with the water inlet of the water inlet section 2 of the self-pressure air suction oxygenation drain pipe to be tested;
(C) the valve 50 is opened, the opening of the valve 50 is adjusted, the water flow pressure in the second pipeline 60 is measured by using the second pressure gauge 70, the water inflow of the water inlet section 2 of the measured self-pressure air suction oxygenation drain pipe is measured by using the water flow gauge 80, and the air suction flow of the air inlet pipe 6 of the measured self-pressure air suction oxygenation drain pipe is measured by using the gas flow gauge 90, so that the air suction flow of the air inlet pipe 6 is tested under different water flow pressures or different water inlet flows.
The working pressure of the self-pressure air-suction oxygen-increasing water discharge pipe is generally 0.1-0.5MPa, and the variable frequency power supply can be adjusted to control the submersible pump so that the measured value of the first pressure gauge 40 is a set pressure value (for example, 0.1MPa, 0.2MPa and 0.5 MPa).
The set pressure value is determined according to a test pressure range required by the self-pressure air-suction oxygen-increasing water drain pipe to be tested, and the set pressure value is larger than the maximum value of the required test pressure range. The setting can be made as desired by those skilled in the art.
In the step (a), the valve 50 is closed, so that the measurement value of the first pressure gauge 40 is not affected by the water flow of the second pipe 60 on the other side of the valve 50.
In step (C), the operation is performed under a constant pressure (the measured value of the second pressure gauge 70 is kept constant) or under a constant water inlet flow rate (the measured value of the water flow gauge 80 is kept constant), and the reading of the gas flow meter 90 is recorded for a certain time (for example, 15 minutes or 30 minutes or one hour), so as to obtain the air suction and oxygen increasing performance of the measured self-pressure air suction and oxygen increasing water outlet pipe under the constant pressure or the constant water inlet flow rate.
The following table 1 shows the performance test examples of a self-pressure air-suction oxygen-increasing water drain pipe.
TABLE 1 phi 63 Performance test result table for self-pressure air-suction oxygen-increasing water drain pipe
The structural size parameters of the self-pressure air-suction oxygen-increasing water drain pipe adopted in the test in the table 1 are as follows: d1 is 63mm, total length is 320mm, length of contraction section L1 is 95mm, length of aeration section L2 is 100mm, and contraction ratio D is 0.45.
Example 3: self-pressure air suction oxygenation water discharge pipe structure parameter optimization method
The invention also provides a method for optimizing the size parameters of the sizing design structure of the self-pressure air-suction oxygen-increasing water drain pipe by using the performance test method and the performance test equipment.
The invention of the self-pressure air suction oxygen increasing and water discharging pipe 100 provides an effective way for oxygen increasing and irrigation of the rice field in a wide range. In order to convert research results into practical technology capable of being widely applied to oxygen-increasing irrigation of rice fields, the structure size of the key part of the oxygen-increasing irrigation water drain pipe 100 needs to be further optimized so as to select an optimal structure size parameter combination scheme for product design and batch production of the oxygen-increasing irrigation water drain pipe 100.
The air suction and oxygenation principle of the self-pressure air suction and oxygenation water drain pipe is as follows:
the average speed, the average pressure and the sectional area of the water flow at the inlet section of the bell mouth contraction section 3 and the water flow at the throat 4 are respectively V1、P1、S1And V2、P2、S2(ii) a Water flow density is rho, water discharge pipe 100The flow rate of the reclaimed water is Q.
The energy of the self-pressure air-suction oxygen-increasing water discharge pipe 100 capable of automatically sucking air comes from P1And P2Pressure difference (Δ P ═ P) of1-P2)。
According to the water flow continuity equation and Bernoulli's theorem, it is noted that the elevations of the two ends of the pipe body are equal, and the flow line of the average motion in the pipe is equal, and it can be found that:
Q＝S1V1＝S2V2(1.1)
setting the shrinkage ratio d as follows:
formula (1.7) indicates that: when the flow and the pipe diameter of the water supply pipeline are constant, the contraction ratio D of the oxygen increasing and water discharging pipe 100 is reduced, namely the inner diameter D of the throat pipe2The negative pressure delta generated at the throat part is reducedPThe air flow can be exponentially increased, and the air suction and oxygenation are facilitated; according to the hydraulics principle, when the pressure of the water supply pipeline is constant, D2Scaling down to a certain extent affects the pipe flow capacity. Combining these two points, the explanation V1、P1、S1And V2、P2、S2There is oneOptimal dynamic balance. Thus, the change in the shrinkage ratio D, i.e., D2Will cause V2、P2、S2Changes accordingly, and further causes a negative pressure deltaPChanges, ultimately affecting the gettering effect. The contraction ratio d is the most key structural parameter of the self-pressure air-breathing oxygen-increasing water discharge pipe 100, and meanwhile, the length of the bell-mouth contraction section and the length of the throat (aeration section) influence the aeration effect of the self-pressure air-breathing oxygen-increasing water discharge pipe 100 to a certain degree.
The key part of the self-pressure air suction and oxygenation water discharge pipe 100 is provided with three sections of contraction, air suction and aeration (gas-liquid fusion), and when the pipe diameter is determined, corresponding key structural parameters comprise the total length L, the contraction ratio d and the length L of the bell mouth contraction section1Length L of aeration and oxygenation section2. The change of the construction parameters of each part can affect the aeration and oxygenation effects of the oxygenation and drainage pipe 100 to different degrees. Theoretically, the self-pressure air-suction oxygen-increasing water discharge pipe 100 has any possible structural combination scheme, but the contraction ratio d and the length L of the bell-mouth contraction section1Length L of aeration and oxygenation section2The 3 structural size parameters are key structural parameters for determining the air suction and oxygen increasing performance of the oxygen increasing water drain pipe, and a group of better structural parameter combination schemes exist, so that the oxygen increasing effect is better.
According to the principle analysis, the invention provides a method for optimizing the structure parameters of a self-pressure air suction oxygenation water drain pipe.
Defining a first length L1A second length L is defined for the length of the bell mouth contraction section 3 in the length direction of the self-pressure air suction oxygenation water discharge pipe2The length of an aeration oxygenation section 10 in the length direction of the self-pressure air suction oxygenation discharge pipe is defined as the distance between one end, far away from the water inlet section 2, of the bottom opening of the air suction cavity 7 and the water inlet section 2, close to the vibrating piece 8, of the aeration oxygenation section 10, and the contraction ratio D is D2/D1, wherein the first inner diameter D1 is the inner diameter of the water inlet section 2, and the second inner diameter D is2The inner diameter of the throat 4.
The pipe diameter of 63mm is a common standard pipe diameter of a field water diversion port in a pipeline irrigation area. Therefore, in the present invention, the inner diameter of the water inlet section 2 (i.e., the inner diameter of the water inlet section 2) is preferably D1-63 mm.
From the viewpoint of easy installation, use and maintenance and reducing the influence on the farming activities, the total length of the oxygen increasing and water discharging pipe 100 should be as short as possible, so that the oxygen increasing and water discharging pipe is as compact as possible without affecting the function principle. In the present invention, the total length L of the oxygen increasing and discharging pipe 100 is preferably in the range of 35cm to 40 cm.
D, L1、L2The method comprises the following steps of dividing the raw materials into 3 groups, changing 1 parameter for each group by 4 gears, fixing the other 2 parameters, forming 12 schemes together, manufacturing 2 oxygen increasing and water discharging pipes 100 for each scheme by adopting a 3D printing technology, and testing the aeration and oxygen increasing effects by adopting the testing equipment.
The parameter optimization method of the self-pressure air suction oxygenation water drain pipe structure comprises the step of optimizing the first length L1And/or the second length L2And/or a sub-method for optimizing the contraction ratio d.
(1) Optimization sub-method of first length L1
The first length L1The optimization sub-method comprises the following steps:
step (1-1): firstly, only the first length L is different with N11The other structural size parameters of the tested self-pressure air-suction oxygen-increasing water drain pipe are the same as N1, and the step (A) of the performance test method of the self-pressure air-suction oxygen-increasing water drain pipe is executed;
step (1-2): then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-suction oxygen-increasing drain pipe on the N1 tested self-pressure air-suction oxygen-increasing drain pipes, and keeping the measured value of the second pressure gauge 70 in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing drain pipe to obtain the air suction flow of the air inlet pipe 6 of each tested self-pressure air-suction oxygen-increasing drain pipe;
step (1-3): and finally, determining the optimal value or the optimal range of the first length L1 according to the air suction flow of the air inlet pipe 6 of each measured self-pressure air suction oxygenation water discharge pipe. That is, the first length L1 of the measured self-pressure air-suction oxygen-increasing water discharge pipe with the maximum air suction flow rate can be selected as an optimal value. The size range limited by the first length L1 of the plurality of measured self-pressure air suction oxygen increasing and water discharging pipes with larger air suction flow can also be selected as the optimal range of the first length L1.
A preferred specific example of the length L1 of the flare constriction 3 is given below.
Length L of flare constriction1The longer the water flow, the more gradual the change of the water flow form, the smaller the local head loss, which is beneficial to air suction and oxygen increasing, but correspondingly increases the overall length and the manufacturing cost of the oxygen increasing water drain pipe 100, and is also not beneficial to field installation and application. Mixing L with1/D1Set from 0.8 to 2.0, divide by 4 to set up L1，d、L2The oxygen increasing and water discharging pipe 100 with 4 different bell mouth contraction section lengths is manufactured, the performance test equipment of the invention is adopted to test the air suction volume, and the test results are shown in the table 2:
TABLE 2 Bell mouth contraction section length optimization test results
As can be seen from Table 2, the total flow capacity and air suction of the 4 different bell-mouth contraction section length oxygen increasing and water discharging pipes 100 has no obvious difference, but L1/D1Preferably 1.0 to 1.5. Considering that the oxygen increasing and water discharging pipe 100 is positioned at the tail end of the pipe irrigation system, the longer the pipe is, the greater the interference to the farming activities is, and the easier the machine farming is to be damaged. Therefore, the length of the flare constriction is preferably 1.5 times (95mm) the inner diameter of the pipe.
(2) Sub-method for optimizing shrinkage ratio d
The sub-method for optimizing the contraction ratio d comprises the following steps:
step (2-1): firstly, adopting N2 tested self-pressure air suction and oxygen increasing water discharge pipes with different contraction ratios D, and executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipe by adopting N2 tested self-pressure air suction and oxygen increasing water discharge pipes with the same structural size parameters except for the first inner diameter D1 and the second inner diameter D2;
step (2-2): then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-suction oxygen-increasing water drain pipe for the N2 tested self-pressure air-suction oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge 70 in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe 6 and the water inlet flow of the water inlet section 2 of each tested oxygen-increasing water drain pipe;
step (2-3): and finally, determining the optimal value or the optimal range of the contraction ratio d according to the air suction flow of the air inlet pipe 6 of each detected oxygen increasing water drain pipe and the water inlet flow of the water inlet section 2. Namely, the shrinkage ratio d of the measured self-pressure air suction and oxygen increasing water drain pipe with large air suction flow and water inlet flow (with small difference with the maximum air suction flow and the maximum water inlet flow in other measured oxygen increasing water drain pipes or with two parameters ranked at the front in all the measured oxygen increasing water drain pipes) can be selected as an optimal value. The size range limited by the contraction ratio d of a plurality of measured self-pressure air suction and aeration water discharging pipes with larger air suction flow and water inlet flow (with smaller difference with the maximum air suction flow and the maximum water inlet flow in other measured aeration water discharging pipes or with two parameters ranked at the front in all the measured aeration water discharging pipes) can also be selected as the optimal range of the contraction ratio d.
Preferred specific examples of the shrinkage ratio d are given below.
The energy required by the air suction of the oxygen increasing and water discharging pipe 100 comes from the negative pressure delta generated at the throat partPFrom the formula (1.7), it can be seen thatPIs composed of 2 factors.
Is provided with
Then aP＝ΔP1*ΔP2。
ΔP1An objective factor term, which is determined by the actual flow rate of the water supply pipe and the inner diameter of the pipe, and belongs to a determinate term, DeltaP2Is a variable term, determined by the contraction ratio d. The change d can significantly change ΔP. I.e. when the water supply pipe and the flow rate are constant, deltaP1For a fixed value, different delta can be generated at the throat of the oxygen increasing and water discharging pipe 100 with different contraction ratiosP2 and the difference is very large as shown in table 3.
TABLE 3 throat shrinkage ratio vs. negative pressure relationship
| d | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.55 | 0.6 |
| ΔP2 | 122.45 | 65.64 | 38.06 | 23.38 | 15.00 | 9.93 | 6.71 |
d is a key parameter for determining the oxygen-increasing air suction capacity and can influence the flow capacity to a certain extent. In order to prove proper d, 4 oxygenation drain pipes 100 with different contraction ratios and the same other structural parameters are manufactured, the performance testing equipment is adopted for testing, and the air suction volumes of the oxygenation drain pipes 100 with 4 schemes are shown in table 4:
TABLE 4 shrinkage ratio parameter optimization test results
Test tests show that when the pipeline pressure is the same (0.2Mpa), the smaller the contraction ratio is, the better the air suction effect is, but when the contraction ratio is less than 0.4, the flow-through capacity of the oxygen increasing and water discharging pipe 100 can be influenced, and when the contraction ratio is more than 0.4, the contraction ratio is continuously increased, the flow-through capacity is basically not influenced, but the air suction capacity is obviously reduced. Accordingly, the shrinkage ratio d is preferably 0.4 to 0.45.
(3) Optimization sub-method of second length L2
The optimization sub-method of the second length L2 includes:
step (3-1), firstly, adopting N3 tested self-pressure air-suction oxygen-increasing water discharge pipes with different second lengths L2, wherein other structural size parameters of the N3 tested self-pressure air-suction oxygen-increasing water discharge pipes are the same, and executing the step (A) of the performance test method of the self-pressure air-suction oxygen-increasing water discharge pipes;
step (3-2), then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-breathing oxygen-increasing water drain pipe on the N3 tested self-pressure air-breathing oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge 70 in the step (C) to be the same value in the test of each tested self-pressure air-breathing oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe 6 of each tested oxygen-increasing water drain pipe;
and (3-3) finally, determining the optimal value or the optimal range of the second length L2 according to the air suction flow of the air inlet pipe 6 of each detected oxygen increasing and water discharging pipe. That is, the second length L2 of the measured self-pressure air-suction oxygen-increasing water discharge pipe with the maximum air suction flow rate can be selected as an optimal value. The size range limited by the second length L2 of the plurality of measured self-pressure air suction oxygen increasing and water discharging pipes with larger air suction flow can also be selected as the optimal range of the second length L2.
In a preferred embodiment, when the value of the contraction ratio D is adjusted, the value of the first inner diameter D1 is made to be a fixed value, and other structural dimension parameters of the oxygen increasing discharge pipe 100 except the second inner diameter D2 are kept unchanged, the water inlet speed of the water inlet section 2 of the oxygen increasing discharge pipe 100 with different contraction ratios D is calculated according to the change value of the measurement value of the water flow meter 80 within a certain time, the air suction speed of the air inlet pipe 6 of the oxygen increasing discharge pipe 100 with different contraction ratios D is calculated according to the change value of the measurement value of the air flow meter 90 within a certain time, and then the optimal range or the optimal value of the contraction ratio D is determined according to the water inlet speed of the water inlet section 2 of the oxygen increasing discharge pipe 100 with different contraction ratios D and the air suction speed of the air inlet pipe 6, so that the optimal range or the optimal value of the.
Preferred embodiments of the length L2 of the aeration zone are given below.
As shown in fig. 2, in the present invention, the length L2 of the aerated oxygen increasing section is defined as the distance between the end of the aerated oxygen increasing section 10 close to the water inlet section 2 and the end of the vibrating piece 8 close to the water inlet section 2 along the length direction of the oxygen increasing water discharging pipe 100. After the water flow of the throat pipe is dragged into air through the air mixing port, the gas-liquid fusion is completed through the air mixing section. If the aeration section is too short, the gas-liquid fusion is insufficient, most of air bubbles doped in the water body can be broken quickly after the aeration water flows through the nozzle and the elbow and return to the atmosphere, so that the oxygenation effect is influenced, but if the aeration section is too long, the air inflow of an aeration opening is influenced due to turbulent flow and backflow of the aeration water flow of the throat pipe, and even the whole oscillation of the oxygenation pipe is caused. 4 aeration discharge pipes 100 with different lengths of aeration and oxygen increasing sections and the same other structural parameters are manufactured, and the performance test equipment is adopted for testing to preferably select the length parameters of the aeration and oxygen increasing sections. The air suction of the 4 oxygen aeration discharge pipes 100 with different aeration sections is shown in table 5:
TABLE 5 length parameter optimization test results of aeration and oxygenation sections
Test results show that the length of the aeration oxygen increasing section is increased, the air suction is influenced, and the longer the L2 is, the smaller the air suction is. Experiments show that when the length of the aerated oxygen increasing section is 200mm, the vibration of the oxygen increasing water discharge pipe 100 is large, and the oxygen increasing water discharge pipe 100 vibrates more and more along with the increase of the working pressure of the pipeline. But the physical principle shows that the longer the L2 is, the better the air sucked from the air suction cavity is mixed with the water flow, which is beneficial to improving the aeration and oxygenation effects. Comprehensively balancing the advantages and disadvantages, and preferably selecting the length of the aeration oxygen-increasing section to be 100 mm.
And (3) integrating the test results of the oxygen increasing water drain pipe, and determining the structural parameters of the oxygen increasing water drain pipe shown in the table 6.
TABLE 6 optimized result of structural parameters of self-pressure air-suction oxygen-increasing water discharge pipe
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading this disclosure, modifications of various equivalent forms of the present invention by those skilled in the art will fall within the scope of the present application, as defined in the appended claims. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Claims (8)
1. A self-pressure air suction oxygenation drain pipe performance test device is characterized in that a tested self-pressure air suction oxygenation drain pipe comprises a water inlet section (2), a bell mouth contraction section (3), a throat (4), an air inlet pipe (6), an air suction cavity (7), an air entrainment oxygenation section (10), an elbow (9) and a vibrating piece (8); the elbow (9) is connected with the tail end of the aeration oxygenation section (10), and the upper part of one end of the throat pipe (4) close to the aeration oxygenation section (10) is provided with an air suction cavity (7) with an arc-shaped longitudinal section; the cross sectional area of the air suction cavity (7) is gradually reduced from outside to inside, an opening at the bottom of the air suction cavity (7) faces one side of the aeration oxygenation section (10), the upper part of the air suction cavity (7) is connected with an air inlet pipe (6), and air sucked through the air inlet pipe (6) and the air suction cavity (7) in sequence is mixed into water flow in an air bubble mode through the aeration oxygenation section (10); a vibrating reed (8) is fixed in the elbow (9), and the vibrating reed (8) generates high-frequency vibration under the impact of water flow, so that air bubbles mixed in the water flow are crushed to form micro bubbles;
the method is characterized in that: the performance test equipment comprises a submersible pump (20), a variable frequency power supply (201), a valve (50) with adjustable opening degree, a first pipeline (30) and a second pipeline (60); the output end of the variable frequency power supply (201) is connected with the submersible pump (20); one end of the second pipeline (60) is connected with the outlet of the valve (50), and the other end of the second pipeline is used for being connected with the water inlet of the water inlet section (2) of the self-pressure air-suction oxygen-increasing water drain pipe to be tested;
the performance test equipment further comprises a water flow meter (80) for measuring the water inlet flow of the water inlet section (2) of the measured self-pressure air suction oxygenation drain pipe, a gas flow meter (90) for measuring the air suction flow of the air inlet pipe (6) of the measured self-pressure air suction oxygenation drain pipe, a first pressure meter (40) for measuring the water flow pressure in the first pipeline (30), and a second pressure meter (70) for measuring the water flow pressure in the second pipeline (60).
2. The self-pressure air suction oxygenation water drain pipe performance test equipment as claimed in claim 1, wherein: the air inlet of the gas flow meter (90) is connected with the outside air, and the air outlet of the gas flow meter (90) is in butt joint with the air suction port of the air inlet pipe (6).
3. The self-pressure air suction oxygenation water drain pipe performance test equipment as claimed in claim 1, wherein: the gas flow meter (90) is a mechanical gas meter.
4. The self-pressure air suction oxygenation water drain pipe performance test equipment as claimed in claim 1, wherein: the submersible pump (20) is arranged in the water storage facility (200), and the outlet of the elbow (9) is arranged towards the opening of the water storage facility (200).
5. The self-pressure air suction oxygenation water drain pipe performance test equipment as claimed in claim 1, wherein: the inlet water flow of the measured self-pressure air-suction oxygen-increasing water drain pipe is taken from the water storage facility (200), the outlet water flow of the measured self-pressure air-suction oxygen-increasing water drain pipe is optionally discharged into the water storage facility (200), and the inlet and the outlet of the measured self-pressure air-suction oxygen-increasing water drain pipe and the water storage facility form a closed loop.
6. A performance test method of a self-pressure air suction oxygen increasing water discharge pipe by using the performance test equipment of the self-pressure air suction oxygen increasing water discharge pipe of any one of claims 1 to 5 is characterized by comprising the following steps: the air suction flow measured by an air flow meter (90) when the self-pressure air suction oxygenation water discharge pipe operates is used as a main index for evaluating the performance of the self-pressure air suction oxygenation water discharge pipe.
7. A performance test method of a self-pressure air suction oxygen increasing water discharge pipe by using the performance test equipment of the self-pressure air suction oxygen increasing water discharge pipe of any one of claims 1 to 5 is characterized by comprising the following steps: the method comprises the following steps:
(A) starting the variable frequency power supply (201), enabling the submersible pump (20) to start working, enabling the valve (50) to be closed, and adjusting the variable frequency power supply (201) to enable the measured value of the first pressure gauge (40) to be a set pressure value;
(B) the air outlet of the gas flowmeter (90) is butted with the air suction port of the air inlet pipe (6) of the self-pressure air suction oxygenation drain pipe to be detected, and the other end of the second pipeline (60) is butted with the water inlet of the water inlet section (2) of the self-pressure air suction oxygenation drain pipe to be detected;
(C) the valve (50) is opened, the opening of the valve (50) is adjusted, the water flow pressure in the second pipeline (60) is measured by using the second pressure gauge (70), the water inflow of the water inlet section (2) of the measured self-pressure air suction oxygenation drainage pipe is measured by using the water flow gauge (80), the air suction flow of the air inlet pipe (6) of the measured self-pressure air suction oxygenation drainage pipe is measured by using the gas flow gauge (90), and therefore the air suction flow of the air inlet pipe (6) of the self-pressure air suction oxygenation drainage pipe corresponding to the set water flow pressure or set water inlet flow working condition is tested.
8. A method for optimizing structural size parameters of a self-pressure air suction oxygenation drain pipe is characterized in that a first length L1 is defined as the length of a bell mouth contraction section (3) in the length direction of the self-pressure air suction oxygenation drain pipe, a second length L2 is defined as the length of an aeration oxygenation section (10) in the length direction of the self-pressure air suction oxygenation drain pipe, the length of the aeration oxygenation section (10) is the distance between one end, far away from a water inlet section (2), of an opening at the bottom of an air suction cavity (7) and the water inlet section (2) close to a vibrating plate (8), a contraction ratio D = D2/D1 is defined, a first inner diameter D1 is the inner diameter of the water inlet section (2), and a second inner diameter D2 is the inner diameter of a throat pipe (4), and the method is characterized in that: the parameter optimization method of the self-pressure air suction oxygen increasing water drain pipe comprises an optimization sub-method of the first length L1 and/or an optimization sub-method of the second length L2 and/or an optimization sub-method of the contraction ratio d;
the optimization sub-method of the first length L1 comprises: firstly, using N1 tested self-pressure air suction and oxygen increasing water discharge pipes with different first lengths L1 and N1 tested self-pressure air suction and oxygen increasing water discharge pipes with the same other structural size parameters, executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipes as claimed in claim 7; then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-breathing oxygen-increasing water drain pipe as claimed in claim 7 on N1 tested self-pressure air-breathing oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge (70) in the step (C) to be the same value in the test of each tested self-pressure air-breathing oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe (6) of each tested self-pressure air-breathing oxygen-increasing water drain pipe; finally, determining the optimal value or the optimal range of the first length L1 according to the air suction flow of an air inlet pipe (6) of each measured self-pressure air suction oxygenation water discharge pipe;
the sub-method for optimizing the contraction ratio d comprises the following steps: firstly, using N2 tested self-pressure air suction and oxygen increasing discharge pipes with different contraction ratios D, and N2 tested self-pressure air suction and oxygen increasing discharge pipes with the same structural size parameters except for the first inner diameter D1 and the second inner diameter D2, executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing discharge pipe of claim 7; then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-suction oxygen-increasing water drain pipe of the claim 7 on N2 tested self-pressure air-suction oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge (70) in the step (C) to be the same value in the test of each tested self-pressure air-suction oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe (6) and the water inlet flow of the water inlet section (2) of each tested oxygen-increasing water drain pipe; finally, determining the optimal value or the optimal range of the contraction ratio d according to the air suction flow of the air inlet pipe (6) and the water inlet flow of the water inlet section (2) of each measured oxygen increasing and water discharging pipe;
the optimization sub-method of the second length L2 includes: firstly, using N3 tested self-pressure air suction and oxygen increasing water discharge pipes with different second lengths L2 and N3 tested self-pressure air suction and oxygen increasing water discharge pipes with the same other structural size parameters, executing the step (A) of the performance test method of the self-pressure air suction and oxygen increasing water discharge pipes as claimed in claim 7; then, respectively executing the step (B) and the step (C) of the performance test method of the self-pressure air-breathing oxygen-increasing water drain pipe according to claim 7 on N3 tested self-pressure air-breathing oxygen-increasing water drain pipes, and keeping the measured value of the second pressure gauge (70) in the step (C) to be the same value in the test of each tested self-pressure air-breathing oxygen-increasing water drain pipe to obtain the air suction flow of the air inlet pipe (6) of each tested oxygen-increasing water drain pipe; and finally, determining the optimal value or the optimal range of the second length L2 according to the air suction flow of the air inlet pipe (6) of each detected oxygen increasing and water discharging pipe.
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