A method and device for regulating the amplitude of dynamic water pressure of drip irrigation based on air injection amount

Abstract

The application belongs to the field of air-adding micro-irrigation, and discloses a drip irrigation dynamic water pressure amplitude regulation and control method and device based on air-adding amount, which comprises the following steps: determining a pipeline pressure head amplitude based on a dynamic water pressure amplitude decay model according to the length from an air-adding port to a target position, a required air-adding amount, a required pipeline flow, and a required dynamic water pressure amplitude of the target position; determining a pipeline pressure head based on a pipeline pressure head amplitude model according to the pipeline pressure head amplitude and the required air-adding amount; determining a variable frequency air compression pump working frequency based on a variable frequency air compression pump working frequency model according to the required air-adding amount; and controlling a variable frequency water pump to provide the pipeline pressure head and controlling the variable frequency air compression pump to reach the variable frequency air compression pump working frequency, so as to realize dynamic water pressure amplitude regulation and control of the target position of the pipeline. The application can improve drip irrigation quality and optimize drip irrigation system performance.

Description

TECHNICAL FIELD

[0001] The present application relates to, in particular to a kind of based on the dynamic water pressure amplitude regulation and control method and device of drip irrigation air quantity. BACKGROUND

[0002] Drip irrigation technology has water-saving performance, high irrigation quality, save time and labor and other significant advantages, is the most widely used water-saving irrigation technology in China.Dripper is the core component of the composition drip irrigation system, but drip head clogging is one of the main factors restricting the further popularization of drip irrigation technology.

[0003] Drip irrigation technology as the most advanced water-saving irrigation technology in the world, water-saving effect is remarkable, and can realize water and fertilizer integration operation, save time and labor.Drip irrigation system on the market generally uses constant pressure water source, although the flow state in pipe and irrigator is relatively stable, but there are certain drawbacks, the water flow in pipe is constant, the impact force on silt and other fine particles is small, and it is easy to cause the condensation deposition inside pipe. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a kind of based on the dynamic water pressure amplitude regulation and control method and device of drip irrigation air quantity, can improve drip irrigation quality, optimize drip irrigation system performance.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application provides a kind of based on the dynamic water pressure amplitude regulation and control method of drip irrigation air quantity, this method includes: according to test, establishes dynamic water pressure amplitude decay model, pipe pressure head model and variable frequency air compressor pump working frequency model;According to the length of air inlet to target position, required air quantity, required pipe flow, target position required dynamic water pressure amplitude, based on the dynamic water pressure amplitude decay model, determine pipe pressure head amplitude;According to the pipe pressure head amplitude, the required air quantity, based on the pipe pressure head model, determine pipe pressure head;According to the required air quantity, based on the variable frequency air compressor pump working frequency model, determine variable frequency air compressor pump working frequency;The variable frequency water pump is controlled to provide the pipe pressure head and the variable frequency air compressor pump is controlled to reach the variable frequency air compressor pump working frequency, to realize the dynamic water pressure amplitude regulation and control of target position of pipe.

[0006] The dynamic water pressure amplitude decay model is:

[0007] f=k1+k2Q+k3Q a +k4L+f′

[0008] Wherein, f is pipe pressure head amplitude, Q a Required air quantity, Q is required pipe flow, f′ is target position required dynamic water pressure amplitude, L is the length of air inlet to target position, k1, k2, k3, k4 is amplitude coefficient.

[0009] The pipeline pressure head model is:

[0010]

[0011] Wherein, H0 is the pipeline pressure head, f is the pipeline pressure head amplitude, Q a is the required air supply, k4, k5, k6 are head coefficients.

[0012] The variable frequency air compression pump working frequency model is:

[0013] H z =k7+k8Q a

[0014] Wherein, H z is the variable frequency air compression pump working frequency, Q a is the required air supply, k7, k8 are working frequency coefficients.

[0015] The embodiment of the application also provides a drip irrigation dynamic water pressure amplitude regulation and control device based on air supply, which executes the drip irrigation dynamic water pressure amplitude regulation and control method based on air supply described above, and comprises a touch screen, a PLC controller, a frequency converter, a variable frequency water pump, a one-way valve, a variable frequency air compression pump, a pressure sensor, a gas flow meter, an analog converter and a computer. The PLC controller is used to control and adjust the frequency of the variable frequency water pump and the variable frequency air compression pump through the frequency converter. The one-way valve is used to realize one-way air supply of the pipeline and prevent water backflow in the case of no air supply. The variable frequency air compression pump is directly driven by a variable frequency motor to work, and is used to realize control of the air supply of the pipeline. The computer is used to collect the pipeline pressure and the air supply of the pipeline in real time through the pressure sensor, the gas flow meter and the analog converter.

[0016] Through the drip irrigation dynamic water pressure amplitude regulation and control method and device based on air supply provided by the embodiment of the application, the method can combine air irrigation and dynamic water pressure and other new agricultural technologies by controlling the variable frequency water pump to provide pipeline pressure head and controlling the variable frequency air compression pump to achieve variable frequency air compression pump working frequency according to user demand, so that the drip irrigation quality can be improved and the performance of the drip irrigation system can be optimized. The method provides a reference for further development of modern agriculture.

[0017] Other features and advantages of the embodiment of the application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the embodiment of the application, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiment of the application, but do not constitute a limitation on the embodiment of the application. In the drawings:

[0019] Figure 1 is a schematic diagram of a drip irrigation dynamic water pressure amplitude regulation device based on air injection amount provided by an embodiment of the present application;

[0020] Figure 2 is a flow chart of a drip irrigation dynamic water pressure amplitude regulation method based on air injection amount provided by an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the relationship between the working frequency of a variable frequency air compression pump and the air injection amount;

[0022] Figure 4 is a schematic diagram of the change of the drip irrigation dynamic water pressure amplitude based on air injection amount provided by an embodiment of the present application.

[0023] Legend of reference signs

[0024] 1-touch screen, 2-PLC controller, 3-frequency converter, 4-variable frequency water pump, 5-one-way valve, 6-variable frequency air compression pump, 7-pressure sensor, 8-gas flow meter, 9-analog converter, 10-computer. DETAILED DESCRIPTION

[0025] The specific embodiments of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application.

[0026] Figure 1 is a schematic diagram of a drip irrigation dynamic water pressure amplitude regulation device based on air injection amount provided by an embodiment of the present application. As shown in Figure 1 , the system includes a touch screen 1, a PLC controller 2, a frequency converter 3, a variable frequency water pump 4, a one-way valve 5, a variable frequency air compression pump 6, a pressure sensor 7, a gas flow meter 8, an analog converter 9, a computer 10 and other components, the variable frequency water pump 4 and the variable frequency air compression pump 6 are controlled by the PLC controller 2; The one-way valve 5 needs to be installed before the bypass air injection pipe of the dry pipe, connected to the air injection pipe, to prevent the water from flowing back when the air injection condition is not met; The variable frequency air compression pump 6 is a variable frequency motor driven air cylinder working directly, used to control the air injection amount of the pipeline; The pressure sensor and the gas flow meter data are monitored by the Kingview software. The material of the system pipeline is PVC, and the pipeline diameter is 32 mm.

[0027] Figure 2 is a flow chart of a drip irrigation dynamic water pressure amplitude regulation method based on air injection amount provided by an embodiment of the present application. As shown in Figure 2 , the method comprises:

[0028] S201, a dynamic water pressure amplitude attenuation model, a pipeline pressure head amplitude model and a variable frequency air compression pump working frequency model are established according to the test;

[0029] Specifically, a variable frequency air compression pump connected with the air charging pipe is arranged at the head of the drip irrigation system, and a gas flow meter is arranged on the air charging pipe. The target air charging amount is selected to make the variable frequency air compression pump provide continuous and stable air charging amount for the drip irrigation system, and the air charging amount entering the drip irrigation system is recorded in real time through the gas flow meter. The average recording time of each working condition is 10 minutes, so as to ensure that the data is true and reliable. Among them, the average value of the air charging amount of the drip irrigation system fed back in real time by n gas flow meters can be taken as the target value of the working frequency of the variable frequency air compression pump. The pressure sensor arranged along the pipeline records the pipeline pressure change, and the electronic water meter records the pipeline flow change.

[0030] Firstly, the dynamic water pressure amplitude attenuation model is obtained by multiple linear fitting of the pipeline flow, air charging amount, along the position and amplitude attenuation amount.

[0031] The drip irrigation dynamic water pressure amplitude attenuation model is:

[0032]

[0033] Among them, f is the pipeline pressure head amplitude, is the amplitude attenuation amount, Q is the pipeline flow, k1, k2, k3 and k4 are amplitude coefficients. a

[0034] For example, in an embodiment of the present application, the amplitude coefficients k1, k2, k3 and k4 can be obtained through multiple experiments. The amplitude coefficient k1 is 0.192, the amplitude coefficient k2 is-483.218, the amplitude coefficient k3 is 0.013, and the amplitude coefficient k4 is 0.050.

[0035] Table 1 Multiple linear regression results

[0036]

[0037] Then, according to the dynamic water pressure amplitude required at the target position and the amplitude attenuation amount, the model of the pipeline pressure head amplitude can be determined.

[0038] The model of the pipeline pressure head amplitude is:

[0039]

[0040] Among them, f is the pipeline pressure head amplitude, is the amplitude attenuation amount, and f' is the dynamic water pressure amplitude required at the target position.

[0041] ​​Then, the pipeline pressure head, the air injection amount, and the pipeline amplitude are subjected to multiple linear regression to obtain a pipeline pressure head amplitude model.

[0042] The pipeline pressure head amplitude model is:

[0043]

[0044] wherein H0 is the pipeline pressure head, f is the pipeline pressure head amplitude, Q a is the required air injection amount, and k4, k5, and k6 are head coefficients.

[0045] For example, in an embodiment of the present application, the head coefficients k4, k5, and k6 are -0.792, 0.068, and 0.060, respectively, obtained through multiple experiments.

[0046] Table 2: Multiple linear regression results

[0047]

[0048] Finally, the working frequency of the variable frequency air compression pump and the real-time air injection amount data are recorded, the relationship between the working frequency of the variable frequency air compression pump and the air injection amount is obtained through linear fitting, and a variable frequency air compression pump working frequency model is established. The variable frequency air compression pump working frequency model is:

[0049] H z =k7+k8Q a

[0050] wherein H z is the working frequency of the variable frequency air compression pump, Q a is the required air injection amount, and k7 and k8 are working frequency coefficients.

[0051] For example, in an embodiment of the present application, the working frequency coefficients k7 and k8 are -0.574 and 2.244, respectively, obtained through multiple experiments, as shown in the following table. Figure 3

[0052] The preferred values of the coefficients are provided above, but those skilled in the art can understand that the present application is not limited thereto.

[0053] Step S202: determining the pipeline pressure head amplitude based on the dynamic water pressure amplitude decay model according to the length of the air injection port to the target position, the required air injection amount, the required pipeline flow, and the dynamic water pressure amplitude required by the target position;

[0054] Step S203: determining the pipeline pressure head based on the pipeline pressure head model according to the pipeline pressure head amplitude and the required air injection amount.

[0055] ​Step S204, determining the variable frequency air compression pump working frequency based on the variable frequency air compression pump working frequency model according to the required air injection amount;

[0056] Step S205, controlling the variable frequency water pump to provide the pipeline pressure water head and controlling the variable frequency air compression pump to reach the variable frequency air compression pump working frequency, so as to realize the dynamic water pressure amplitude regulation and control of the target position of the pipeline.

[0057] Specifically, by designing a touch screen control interface, the user inputs the required parameters, and the PLC controller calculates the corresponding pipeline pressure water head and variable frequency air compression pump working frequency according to the set program, controls the variable frequency water pump to provide the pipeline pressure water head and controls the variable frequency air compression pump to reach the variable frequency air compression pump working frequency, so as to realize the dynamic water pressure amplitude regulation and control of the target position of the pipeline. The drip irrigation dynamic water pressure amplitude change based on the air injection amount is as shown in Figure 4

[0058] Those skilled in the art will understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0059] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks in the flowcharts and / or block diagrams.

[0060] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks in the flowcharts and / or block diagrams.

[0061] ​These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 Figure 1

[0062] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0063] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the processor can execute instructions. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, or other memory technologies, about which the processor can execute instructions. The memory is an example of computer readable media.

[0064] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically programmable read only memory (EEPROM), flash memory or other memory technologies, compact disc read only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0065] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0066] ​​The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A method for regulating the amplitude of dynamic water pressure in drip irrigation based on the amount of air added, characterized by, The method comprises: According to the experiment, a dynamic water pressure amplitude attenuation model, a pipeline pressure head model and a variable frequency air compression pump working frequency model are established, the dynamic water pressure amplitude attenuation model is: Wherein, is a pipeline pressure head amplitude, is a required air quantity, is a required pipeline flow, is a required dynamic water pressure amplitude of a target position, and L is a length from an air inlet to the target position, , , , is an amplitude coefficient; the pipeline pressure head model is: Wherein, is a pipeline pressure head, is a pipeline pressure head amplitude, is a required air quantity, , , is a head coefficient; and the variable frequency air compression pump working frequency model is: Wherein, is a variable frequency air compression pump working frequency, is a required air quantity, , is a working frequency coefficient. According to the length of the air inlet to the target position, the required air quantity, the required pipeline flow, and the required dynamic water pressure amplitude of the target position, determine the pipeline pressure head amplitude based on the dynamic water pressure amplitude attenuation model; According to the pipeline pressure head amplitude and the required air quantity, determine the pipeline pressure head based on the pipeline pressure head model; According to the required air quantity, determine the variable frequency air compressor pump operating frequency based on the variable frequency air compressor pump operating frequency model; Control the variable frequency water pump to provide the pipeline pressure head and control the variable frequency air compressor pump to reach the variable frequency air compressor pump operating frequency to realize the dynamic water pressure amplitude regulation and control of the target position of the pipeline.

2. A device for regulating the amplitude of dynamic water pressure in drip irrigation based on the amount of air added, characterized by The device executes the method of claim 1, and the device comprises: a touch screen (1), a PLC controller (2), a frequency converter (3), a variable frequency water pump (4), a one-way valve (5), a variable frequency air compressor pump (6), a pressure sensor (7), a gas flow meter (8), an analog converter (9), and a computer (10); The PLC controller (2) is used to control the frequency of the variable frequency water pump (4) and the variable frequency air compressor pump (6) through the frequency converter (3); The one-way valve (5) is used to realize one-way air charging of the pipeline and prevent water backflow in the case of no air charging; The variable frequency air compressor pump (6) is a variable frequency motor driven air cylinder directly working to control the pipeline air charging quantity; The computer (10) is used to collect the pipeline pressure and pipeline air charging quantity in real time through the pressure sensor (7), the gas flow meter (8), and the analog converter (9).

Images