A flow rate test platform for small-flow irrigation devices

Abstract

A flow rate test platform for small-flow irrigation devices, comprising: a water source system continuously supplies water to a constant-pressure water supply system; the constant-pressure water supply system includes a constant-pressure water storage tank, a porous energy dissipation surface, and a water head control mechanism. The porous energy dissipation surface is arranged between the water inlet side and the water outlet side of the constant-pressure water storage tank. The water head control mechanism is used to automatically adjust the constant-pressure water head and supply water to the water conveyance pipeline system; a small-flow irrigation device for testing or a material test shell filled with irrigation device materials is connected to the water conveyance pipeline system; a water collection and drainage circulation system is used to collect the water flowing through the small-flow irrigation device or the material test shell, and drain and recycle the water to the water source system; a flow rate monitoring system is used to obtain the cumulative flow rate of the small-flow irrigation device or the material test shell, and realize the collection and transmission of instructions and data through data acquisition and transmission equipment, and generate a flow rate change curve. The present invention can realize automatic monitoring-control-analysis of various small-flow irrigation devices and irrigation device materials under multiple working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-saving irrigation in arid areas, and particularly relates to a flow rate test platform for small-flow irrigation devices. Background Art

[0002] In agricultural irrigation, the problems of water shortage and waste coexist, and the utilization efficiency of farmland irrigation water is only 0.559, and the utilization of water resources is not scientific, economical and efficient enough. In arid and semi-arid regions, the spatial and temporal distribution of water resources is uneven and scarce. For dryland apples, corn, soybeans, potatoes, etc., it is particularly important to implement small-flow irrigation water-saving measures such as microporous ceramic irrigation, micro-irrigation, subsurface irrigation, etc., which can greatly improve the efficient utilization of water resources in arid areas.

[0003] Precision irrigation is the future development trend of agriculture in arid areas. The key is to select irrigation devices (materials) and hydraulic performance parameters suitable for arid areas, such as small-flow and subsurface irrigation products like microporous ceramic irrigation devices, micro-irrigation tapes, and subsurface irrigation pipes. Almost all existing products cannot achieve precision irrigation, resulting in water resource waste, seepage, etc., causing crop drought and water shortage or the problem of crop roots being soaked, which is not conducive to the growth and development of crops. There are few existing public technologies for testing small-flow irrigation devices, and the existing public technologies for testing other products are relatively traditional, time-consuming, laborious, and cannot achieve real-time, fully automatic multi-scenario working condition automatic monitoring - control - analysis.

[0004] In addition, when testing small-flow irrigation devices, they are more sensitive to changes in water pressure. Therefore, realizing constant-pressure water supply is beneficial to improving the reliability of test results. Summary of the Invention

[0005] The purpose of the present invention is to provide a flow rate test platform for small-flow irrigation devices, which can realize automatic monitoring - control - analysis of various small-flow irrigation devices and irrigation device materials under fully automatic multi-scenario working conditions.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a flow test platform of a small flow emitter, comprising a water source system, a constant pressure water supply system, a water delivery pipeline system, a flow monitoring system and a water collection and drainage circulation system; the water source system continuously supplies water to the constant pressure water supply system, the constant pressure water supply system comprises a constant pressure water storage tank, a porous energy dissipation surface and a water head control mechanism, the porous energy dissipation surface is arranged between the water inlet side and the water outlet side of the constant pressure water storage tank, the water head control mechanism is arranged on the side of the constant pressure water storage tank close to the water source system, and is used to automatically adjust the constant pressure water head and supply water to the water delivery pipeline system; a small flow emitter for testing or a material test shell containing emitter materials is connected to the water delivery pipeline system; the water collection and drainage circulation system is used to collect water flowing through the small flow emitter or the material test shell, and discharge and return the water to the water source system; the flow monitoring system is used to obtain the cumulative flow of the material tested by the small flow emitter or the material test shell, and realize the acquisition and transmission of instructions and data through the data acquisition and transmission equipment to generate a flow change curve.

[0007] The water head control mechanism includes an adjustment plate, a transmission device and a drain pipe. An adjustment groove extending along the height direction of the fixed side wall of the constant pressure water storage tank is provided. A bull's eye bearing is embedded on the groove wall of the adjustment groove. The adjustment plate is a double-layer structure. Support surfaces capable of contacting the bull's eye bearing are provided on both sides of the adjustment plate. The cross-section of the adjustment plate at the support surface is I-shaped. The portion without the support surface has a gap capable of accommodating the fixed side wall. The width of the adjustment plate is greater than the width of the corresponding adjustment groove. A sealing structure is also provided around the adjustment groove and between the adjustment plate. A drain pipe connected to the constant pressure water storage tank is provided on the adjustment plate. The transmission device is provided at the top or bottom of the constant pressure water storage tank to drive the adjustment plate to slide up and down along the adjustment groove.

[0008] As an option, the constant pressure water tank is provided with two adjustment grooves, which are respectively located on the left and right sides of the fixed side wall, the left adjustment groove extends upward from the bottom of the water tank to 1 / 2 of the height of the water tank, and the right adjustment groove extends from 1 / 2 of the height of the water tank to the top of the water tank; the transmission device corresponding to the left adjustment plate is arranged at the bottom of the constant pressure water tank, and the transmission device corresponding to the right adjustment plate is arranged at the top of the constant pressure water tank.

[0009] As another option, the constant pressure water storage tank is provided with an adjustment groove which passes through the fixed side wall vertically, and the overall cross section of the adjustment piece is I-shaped.

[0010] Based on the above scheme, the transmission device has a shell, a millimeter-level threaded macro rod is rotated inside, the nut on the threaded macro rod is fixedly connected to the corresponding adjustment plate, and the threaded macro rod drives the adjustment plate to move up and down after rotation; in the process of the adjustment plate moving up and down, the part located outside the constant pressure water tank can enter the shell of the transmission device.

[0011] Furthermore, a driving mechanism is provided inside the transmission device, and the driving mechanism is controlled by the remote data monitoring, analysis and control APP to drive and rotate the threaded micro rod.

[0012] Furthermore, an exhaust silencing pipe is connected to the drain pipe through a drain pipe tee joint.

[0013] The water conveyance pipeline system is provided with multiple flow measurement main pipelines arranged side by side. One end of each flow measurement main pipeline is communicated with the constant pressure water storage tank, and the other end is closed. Connecting hoses that hang down naturally are connected to the flow measurement main pipelines at intervals, and the ends of the connecting hoses are connected to the small flow irrigation device or the material test shell.

[0014] Specifically, the material test shell includes a cover body and a box body. The box body is in the shape of a hollow cylinder, and a circular protrusion for placing test materials is provided at the bottom thereof. A pressing ring for pressing the test materials is placed inside the box body. A plurality of radially protruding fixing blocks are evenly distributed along the circumferential direction on the inner circular surface of the pressing ring. A sealing water stop rubber ring that presses on the test materials is provided at the bottom of the pressing ring. The cover body and the box body are screwed tightly through threaded cooperation, and an interface for connecting with the connecting hose is provided on the cover body.

[0015] The water collection and drainage circulation system includes a water collection and drainage bucket, a drainage container, drainage branches, a drainage main stream, a return pool and a water pump; the water collection and drainage buckets are arranged one by one directly below the small flow irrigation device or the material test shell. A water level sensor is provided on the barrel wall of the water collection and drainage bucket, and a movable drainage bottom is provided at the bottom of the barrel; a drainage container is also provided at the bottom of the water collection and drainage bucket. A drainage branch is provided directly below the water outlet of the drainage container. Each drainage branch communicates with the return pool through the drainage main stream. The drainage branches, the drainage main stream and the return pool are all arranged on the test bench that serves as the base of the test platform. The water pump is connected to the return pool and the water tank of the water source system.

[0016] Specifically, the movable drainage bottom is formed by two or more bottom plates movably installed at the bottom of the water collection and drainage bucket, and is controlled to open or close by a spring switch. The remote data monitoring, analysis and control APP controls the spring switch to open or close according to the water level signal monitored by the water level sensor. After the bottom plates are reset, a water stop seal is formed through the sealing structure between them.

[0017] The flow monitoring system includes a gravity sensor provided at the bottom of the water collection and drainage bucket. The cumulative weight of the water collection and drainage bucket is collected in real time through the gravity sensor to obtain the cumulative flow rate, and then the data is transmitted to the remote data monitoring, analysis and control APP through the wireless data collection and transmission device.

[0018] The beneficial effects of the present invention are as follows: 1. The small-flow water emitter used in the present invention has the characteristics of micro-pressure, small flow, and adaptive irrigation. By remotely controlling two pieces of double-layer transparent organic glass on the constant-pressure automatic water storage tank, a circular drain opening is provided thereon and connected to an "L"-shaped pipe, which can achieve drainage and maintain constant pressure and noise elimination. The two pieces of double-layer transparent organic glass on the constant-pressure automatic water storage tank achieve vertical sliding through bull's eyes, the water stop strip realizes the sealing of the constant-pressure automatic water storage tank, the transmission device realizes its automation, and the remote wireless transmission module realizes the remote control and automatic adjustment of the working head.

[0019] 2. The present invention can place different types of water emitter materials in the water emitter material test shell for flow rate testing, and can also directly connect the micro-flow water emitter to the PVC hose through a connector for flow rate testing. It meets the single-factor or multi-factor flow rate testing of various water emitters and water emitter materials.

[0020] 3. A drainage induction device is installed at the bottom of the water collection bucket of the present invention, which is controlled by the spring mechanical principle. When the water level in the water collection bucket reaches the specified position, the induction device triggers the spring switch button, opens the bottom, quickly drains and then closes; the water flows through the drainage channel to the return pool, and then is pumped to the water pool of the water source system by a floating water pump to form a complete circulation system, realizing the recycling of water.

[0021] 4. A gravity sensor is placed at the bottom of the water collection bucket of the present invention, and the water in the water collection bucket can be continuously discharged, realizing the continuous flow rate monitoring of the small-flow water emitter (material). Through the wireless transmitter, the remote monitoring and analysis of the flow rate data are realized through the wireless data acquisition and transmission module, obtaining the real-time cumulative flow rate information and curve, saving manpower and material resources. Realize the remote monitoring and automatic processing and analysis of the whole process of water emitter (material) flow measurement. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic diagram of the structure from the first perspective of the present invention;

[0024] Figure 3 is a schematic diagram of the structure from the second perspective of the present invention;

[0025] Figure 4 is a top view of the present invention;

[0026] Figure 5 is a front view of the present invention;

[0027] Figure 6 is a rear view of the present invention;

[0028] Figure 7 is a left view of the present invention;

[0029] Figure 8 is the right view of the present invention;

[0030] Figure 9 is the structural schematic diagram of the material test shell;

[0031] Figure 10 is the structural schematic diagram of the bottom shell in the material test shell from the first perspective;

[0032] Figure 11 is the structural schematic diagram of the bottom shell in the material test shell from the first perspective;

[0033] Figure 12 is the structural schematic diagram of the water collection and drainage bucket from the first perspective;

[0034] Figure 13 is the structural schematic diagram of the water collection and drainage bucket from the second perspective;

[0035] Figure 14 is the sectional view of the water collection and drainage bucket;

[0036] Figure 15 is the flow chart of the small - flow irrigation emitter flow test platform of the present invention;

[0037] Reference numerals: 1, test bench;

[0038] 2, water pool, 2 - 1, floating low - lift water pump in the water pool, 2 - 2, water conveyance hose, 2 - 3, power cord of the floating low - lift water pump in the water pool, 2 - 4, power supply;

[0039] 3, constant - pressure water storage tank, 3 - 1, water inlet of the flow - measuring pipeline, 3 - 2, porous energy - dissipation surface, 3 - 3, fixed side wall, 3 - 4, transmission device, 3 - 5, exhaust and silencing pipe, 3 - 6, drain pipe, 3 - 7, drain outlet, 3 - 8, adjusting piece, 3 - 9, tee joint of the drain pipe, 3 - 10, threaded micro - rod;

[0040] 4, main flow - measuring pipeline, 4 - 1, control valve, 4 - 2, mesh filter, 4 - 3, pipeline fixing clamp, 4 - 4, tee joint, 4 - 5, reducer, 4 - 6, connecting hose, 4 - 7, plug, 4 - 8, material test shell, 4 - 8 - 1, cover body, 4 - 8 - 2, box body, 4 - 8 - 3, annular protrusion, 4 - 8 - 4, external thread, 4 - 8 - 5, fixing block, 4 - 8 - 6, pressing ring, 4 - 8 - 7, irrigation emitter material;

[0041] 5, aluminum alloy support platform, 5 - 1, support platform for the flow - measuring pipeline, 5 - 2, support platform for the constant - pressure water storage tank;

[0042] 6. Wireless data acquisition and transmission device, 6-1. Data transmission wire harness, 6-2. Gravity sensor bracket, 6-3. 12V power supply box, 6-4. Hoop, 6-5. Fixed column, 6-6. Gravity sensor, 6-7. Connecting block;

[0043] 7. Drainage bucket, 7-1. Drainage bucket support platform, 7-2. Drainage branch, 7-3. Return pool, 7-4. Floating low-lift pump in the return pool, 7-5. Return hose, 7-6. Power cord of the floating low-lift pump in the return pool, 7-7. Container drain outlet, 7-8. Main drainage stream, 7-9. Movable drainage bottom, 7-10. Inductive wall surface, 7-11. Rubber water stop strip, 7-12. Drainage container. Detailed implementation mode

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for any limitation to the invention.

[0045] Embodiment 1: This embodiment is based on the attached Figure 1-14 For reference, the small-flow emitter flow test platform described includes a water source system, a constant-pressure water supply system, a water conveyance pipeline system, a support platform, a flow monitoring system, and a drainage and water collection circulation system. The water source system continuously supplies water to the constant-pressure water supply system. The constant-pressure water supply system can automatically adjust the constant-pressure water head and supply water to the water conveyance pipeline system for flow tests at different constant-pressure water heads; the support platform provides support and fixation for the constant-pressure water supply system and the water conveyance pipeline system, ensuring the fixation and stability of the system and reducing the flow test error; the flow monitoring system realizes remote monitoring, control, and analysis of the small-flow emitter flow test through real-time data acquisition, transmission, and control of the constant-pressure water supply system, the water conveyance pipeline system, and the drainage and water collection circulation system.

[0046] The water source system mainly includes a water tank 2, a low-lift pump, and a water conveyance hose 2-2. The low-lift pump provides a stable small flow rate and stably conveys water to the constant-pressure water supply system through the water conveyance hose 2-2. The low-lift pump is a floating low-lift pump, which can realize automatic small-flow water supply and automatic protection of the pump at the same time. When the water level in the water tank is lower than the safe position, the pump stops working.

[0047] The water tank 2 can be designed into shapes such as rectangular and circular according to specific environments and requirements, and the materials can be transparent organic glass, plastic, stainless steel, iron, PE, concrete, etc.

[0048] The low-lift water pump can be selected from different manufacturers, flow rates, lift heights, etc. according to specific requirements. A floating low-lift water pump or a low-lift water pump can be selected according to needs. In this embodiment, the pool floating low-lift water pump 2-1 is made of transparent plexiglass, which is beautiful, easy to observe and record. The water delivery hose is a PVC hose. The power cord 2-3 of the pool floating low-lift water pump is connected to the power supply 2-4 arranged on the test bench 1.

[0049] The main body of the constant pressure water supply system is a constant pressure water storage tank 3. The bottom of the constant pressure water storage tank 3 is connected to the water delivery pipeline system through the water inlet 3-1 of the flow measurement pipeline. A porous energy dissipation surface 3-2 is arranged in the constant pressure water storage tank 3. The water inlet 3-1 of the flow measurement pipeline and the water outlet of the water delivery hose 2-2 are respectively located on both sides of the porous energy dissipation surface 3-2. The porous energy dissipation surface 3-2 is used to buffer the water flow entering the water storage tank, avoiding the potential energy of the water flow input being converted into kinetic energy and having an adverse impact on the test accuracy.

[0050] The constant-pressure water storage tank 3 is provided with a water head control mechanism capable of achieving high-precision water head control, which mainly includes an adjusting piece 3-8, a transmission device 3-4 and a drain pipe 3-6. On the fixed side wall 3-3 of the constant-pressure water storage tank 3 close to the pool 2, two adjusting grooves extending along the height of the water tank are opened, and the two adjusting grooves are respectively located on the left and right sides of the fixed side wall 3-3. Bull's-eye bearings are embedded on the groove walls of the two adjusting grooves. The left adjusting groove extends upward from the bottom of the water storage tank to half of the height of the water storage tank, and the right adjusting groove extends from half of the height of the water storage tank to the top of the water storage tank; the adjusting piece is of a double-layer structure, and the two sides of the adjusting piece are provided with support surfaces that can contact the bull's-eye bearings. The cross-section at the support surface is in the shape of an I, and the part without the support surface has a gap capable of accommodating the fixed side wall. The adjusting piece slides up and down along the adjusting groove by cooperating with the bull's-eye bearing, and the width of the adjusting piece is greater than the width of the corresponding adjusting groove. A rubber water stop strip is used to form a seal between the adjusting piece and the fixed side wall; an opening is provided on the adjusting piece 3-8 and the drain pipe 3-6 is installed to drain the excess water in the constant-pressure water storage tank 3 into the pool 2. During the up and down sliding process of the left adjusting piece 3-8-1, the moving range of the opening position is (0-0.5)H, where H is the height of the constant-pressure water storage tank. Therefore, the water level in the tank can be controlled to change within (0-0.5)H; during the up and down sliding process of the right adjusting piece 3-8-2, the moving range of the opening position on the adjusting piece is (0.5-1)H. Therefore, the water level in the tank can be controlled to change within (0.5-1)H. The up and down sliding of the adjusting piece is controlled by the transmission device 3-4. The transmission device 3-4 corresponding to the left adjusting piece 3-8-1 is arranged at the bottom of the constant-pressure water storage tank 3, and the transmission device 3-4 corresponding to the right adjusting piece 3-8-2 is arranged at the top of the constant-pressure water storage tank 3. The transmission device 3-4 has a housing, and a millimeter-level threaded micro rod 3-10 and a driving motor for driving the threaded micro rod 3-10 to rotate are rotatably arranged inside. The nut on the threaded micro rod 3-10 is fixedly connected to the corresponding adjusting piece. During the up and down sliding process of the adjusting piece, the part located outside the constant-pressure water storage tank 3 can enter the housing of the transmission device 3-4.

[0051] In this embodiment, the I-shaped cross-section part of the left adjusting piece 3-8-1 is at the bottom and the part with the gap is at the top, and the I-shaped end face part of the right adjusting piece 3-8-2 is at the top and the part with the gap is at the bottom; the advantage of such a design is that during the up and down sliding process of the adjusting piece, the double-layer structure of the adjusting piece is always hermetically connected to the inner and outer sides of the fixed side wall, avoiding water leakage.

[0052] Furthermore, a notch is provided at the position of the bottom of the constant-pressure water storage tank 3 corresponding to the left adjusting groove to accommodate the inner part of the left adjusting piece 3-8-1, and a sealing strip is provided at the notch to form a water stop seal with the left adjusting piece 3-8-1.

[0053] Further, an exhaust and silencing pipe 3-5 is connected to the drain pipe 3-6 through a drain pipe tee connector 3-9 to exhaust, silence, and maintain the stability of the constant pressure head.

[0054] As an option, solenoid valves can also be installed on the drain pipes 3-6 of each adjusting piece. When adjusting the water level by sliding an adjusting piece on one side up and down, the solenoid valve on the drain pipe of the adjusting piece on the other side is closed.

[0055] In this embodiment, the constant pressure water storage tank 3 is a transparent plexiglass water tank, the adjusting piece 3-8 is a double-layer transparent plexiglass, and the porous energy dissipation surface 3-2 is a transparent plexiglass energy dissipation surface.

[0056] The water conveyance pipeline system is arranged with 3 channels and 12 flow channels, and is mainly composed of a main flow measurement pipeline 4 and connecting hoses 4-6. There are three main flow measurement pipelines 4, which are laid horizontally in parallel. The head end of the main flow measurement pipeline 4 is communicated with the constant pressure water storage tank 3, and a control valve 4-1 and a mesh filter 4-2 are installed. The tail end of the main flow measurement pipeline 4 is blocked by a plug 4-7. Four connection ports are evenly spaced on the main flow measurement pipeline 4, and the upper end of each connection port is connected to the connecting hose 4-6. The lower end of the connecting hose 4-6 is connected to a small flow rate irrigation device or a material test shell 4-8 for testing. An irrigation device material for testing is installed in the material test shell 4-8, so that the small flow rate irrigation device or the material test shell hangs naturally, and under the influence of gravity, the accuracy of its flow rate test is ensured.

[0057] When the main flow measurement pipeline 4 is composed of multiple short pipes connected together, the short pipes are connected through a tee connector 4-4, and the third interface of the tee connector 4-4 is connected to the upper end of the connecting hose 4-6 through a reducer 4-5.

[0058] The multi-channel and multi-flow channel setting of the water conveyance pipeline system can test the cumulative flow rates of irrigation devices and irrigation device materials under multiple factors. Different channels and flow channels can be set according to actual situations for testing, meeting the variable measurement of single factor and multiple factors; it can also test the cumulative flow rates of different irrigation devices or different irrigation device materials, greatly increasing the diversity and universality of the testing of the present invention.

[0059] The main flow measurement pipeline 4 can be made of transparent plexiglass material, which is easy to observe and beautiful. Its diameter size can be selected according to specific test requirements, generally D15, D20, D25, D32, etc.

[0060] As an option, the tee connector 4-4, the reducer 4-5, and the plug 4-7 can all be made of transparent plexiglass material, and the connecting hose 4-6 is a transparent PVC hose.

[0061] Such as Figure 9-11As shown, the material test shell 4-8 includes a cover 4-8-1 and a box body 4-8-2. The box body 4-8-2 is in the shape of a hollow cylinder, and a circular protrusion 4-8-3 for placing test materials is provided at its bottom. A pressing ring 4-8-6 for pressing the test materials is placed inside the box body 4-8-2. A plurality of radially protruding fixing blocks 4-8-5 are evenly distributed along the circumferential direction on the inner circular surface of the pressing ring 4-8-6. A sealing water-stop rubber ring pressing on the test materials is provided at the bottom of the pressing ring 4-8-6. The cover 4-8-1 and the box body 4-8-2 are screwed tightly through thread fitting. An interface connected to the connecting hose 4-6 is provided on the cover 4-8-1. The irrigation emitter material 4-8-7 for testing is horizontally and closely placed on the circular protrusion 4-8-3 of the box body, and the pressing ring 4-8-6 is placed to seal the perimeter of the irrigation emitter material 4-8-7 against water. Then the cover 4-8-1 is screwed tightly to complete the installation of the material test shell 4-8.

[0062] Continue to refer to Figure 1 As shown, the aluminum alloy support platform 5 is seamlessly welded from aluminum alloy materials and is fixed on the test bench 1. The aluminum alloy support platform 5 is divided into two sub-platforms, namely the constant-pressure water storage tank support platform 5-2 and the flow measurement pipeline support platform 5-1. The constant-pressure water storage tank support platform 5-2 is used to support the constant-pressure water storage tank 3, and the flow measurement pipeline support platform 5-1 is used to fix the water delivery pipeline system. The main flow measurement pipeline 4 of the water delivery pipeline system is fixed on the flow measurement pipeline support platform 5-1 through the pipeline fixing clamp 4-3 to ensure the stability and reliability of flow measurement during long-term operation.

[0063] On Figure 1-4 the basis of, combined with Figure 12-14 As shown, the water collection and drainage circulation system includes a water collection and drainage bucket 7, a drainage container 7-12, drainage tributaries 7-2, a drainage main stream 7-8, a return pool 7-3 and a water pump. The water collection and drainage bucket 7 is arranged directly below the small-flow irrigation emitter or the material test shell for testing and is supported on the water collection and drainage bucket support platform 7-1. The barrel wall of the water collection and drainage bucket 7 is an induction wall surface 7-10, and a water level sensor is provided. A movable drainage bottom 7-9 is provided at the bottom of the water collection and drainage bucket 7. When not draining water, the movable drainage bottom 7-9 is closed, and when draining water is required, the movable drainage bottom 7-9 is opened; a circular gravity sensor support 6-2 is also connected to the bottom of the water collection and drainage bucket 7, and a gravity sensor 6-6 is installed; the drainage container 7-12 is in the shape of a funnel, its upper end is welded to the gravity sensor support 6-2, and a drainage tributary 7-2 is provided directly below the water outlet of the drainage container 7-12. Each drainage tributary 7-2 converges at the drainage main stream 7-8, and the drainage main stream 7-8 is communicated with the return pool 7-3. The drainage tributaries 7-2, the drainage main stream 7-8 and the return pool 7-3 are all arranged on the test bench 1. The water pump in the return pool 7-3 is a floating low-lift water pump, which returns the water in the return pool 7-3 to the water pool 2.

[0064] During the test, water flows through a small flow rate water injector or a material test shell into the drainage bucket below. When the water level in the drainage bucket reaches the set water level, the platform controller controls the movable drainage bottom 7-9 to open and drain the water to the drainage container below, and then drains it into the drainage branch. Since the water is first drained to the drainage container 7-12 during the drainage process, the time is very short, and the error caused is very small and can be ignored. Then the water flows to the drainage main stream 7-8, and finally flows back to the return pool 7-3. When the water level in the return pool 7-3 reaches a certain height, the return pool floating low-lift water pump 7-4 delivers water to the pool 2, so that the pool 2 can achieve continuous water supply and realize water recycling.

[0065] The movable drainage bottom 7-9 is composed of at least two bottom plates movably installed on the bottom of the water collecting and draining bucket 7, and its opening or closing is controlled by the mechanical force of the spring. The remote data monitoring and analysis control APP controls the spring switch to open or close according to the water level signal monitored by the water level sensor. After the spring switch is turned on, the bottom plate flips downward to open the water collecting and draining bucket for drainage. After the bottom plate is reset, a water-stop seal is formed between the bottom plates through the rubber water-stop strips 7-11 to ensure that the water collecting and draining bucket does not leak.

[0066] The flow monitoring system obtains the flow rate by collecting the cumulative weight of the drainage bucket 7 in real time through the gravity sensor 6-6, and then transmits the data to the remote data monitoring and analysis control APP through the wireless data acquisition and transmission device 6. The gravity sensor 6-6 obtains real-time power supply through the 12V power box 6-3, thereby realizing real-time and continuous data transmission.

[0067] In the flow monitoring system, the gravity sensor 6-6 can continuously accumulate and measure the flow, and the flow information is transmitted to the wireless data acquisition and transmission device 6 via the data transmission harness 6-1, and then transmitted to the remote data monitoring and analysis control APP to generate a flow accumulation curve. The wireless data acquisition and transmission device 6 plays the role of a medium connection, which can realize the transmission of remote commands and control, and can collect all the data on the test platform and transmit it in real time, truly realizing monitoring, control, transmission and analysis.

[0068] In the water delivery pipeline system, a fixed column 6 - 5 is correspondingly arranged in each row of flow channels in the transverse direction to install the wireless data acquisition and transmission device 6 to ensure that the wireless data acquisition and transmission device 6 can receive signals well.

[0069] Example 2: The difference between this example and Example 1 is that only one adjustment groove is provided on the fixed side wall of the constant-pressure water storage tank close to the pool side, and the adjustment groove penetrates the fixed side wall up and down. The transmission device is arranged at the bottom of the constant-pressure water storage tank. The overall cross-section of the original double-layer transparent plexiglass adjustment piece is in the shape of an "I", and the length is not less than twice the height of the water storage tank. The opening position on the adjustment piece is located at the center of the length direction of the adjustment piece, so that during the up and down movement of the adjustment piece, the water level adjustment range of the adjustment piece is (0-1)H, and the adjustment piece can always seal the adjustment groove. The settings of the remaining structures are the same as those in Example 1.

[0070] Example 3: On the basis of Example 2, the exhaust silencer pipe is cancelled, reducing the noise reduction treatment. The water in the constant-pressure water storage tank is directly discharged into the pool through the drain pipe.

[0071] Example 4: On the basis of Example 1, the transmission device for controlling the up and down movement of the adjustment piece is cancelled, further reducing the cost. After cancellation, the water level in the constant-pressure water storage tank can be controlled by manually controlling the up and down movement of the adjustment piece for flow measurement.

[0072] Example 5: On the basis of Example 4, ordinary materials such as PVC or PE are used to replace the transparent plexiglass, thus further simplifying the equipment, reducing the cost, reducing the construction cost, and reducing the maintenance burden.

[0073] The above examples are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Those of ordinary skill in the art should understand that the specific implementation manners of the present invention can be modified or equivalently replaced with reference to the above examples. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the scope of the claims pending for approval.

Claims

1. A flow rate test platform for small-flow irrigation devices, characterized in that: It includes a water source system, a constant pressure water supply system, a water conveyance pipeline system, a flow monitoring system and a water collection and drainage circulation system; the water source system continuously supplies water to the constant pressure water supply system, the constant pressure water supply system includes a constant pressure water storage tank, a porous energy dissipation surface and a water head control mechanism, the porous energy dissipation surface is arranged between the water inlet side and the water outlet side of the constant pressure water storage tank, and the water head control mechanism is arranged on one side of the constant pressure water storage tank close to the water source system for automatically adjusting the constant pressure water head and supplying water to the water conveyance pipeline system; a small flow irrigation emitter for testing or a material test shell containing irrigation emitter materials is connected to the water conveyance pipeline system; the water collection and drainage circulation system is used for collecting the water flowing through the small flow irrigation emitter or the material test shell, discharging the water and returning it to the water source system; The flow monitoring system is used to obtain the cumulative flow of the materials measured by the small flow irrigation emitter or the material test shell, and realize the collection and transmission of instructions and data through data acquisition and transmission equipment to generate a flow change curve; The water head control mechanism includes an adjusting piece, a transmission device and a drain pipe. An adjusting groove extending along the height direction is arranged on the fixed side wall of the constant pressure water storage tank. A bull's eye bearing is embedded on the groove wall of the adjusting groove. The adjusting piece is of a double-layer structure. Support surfaces capable of contacting the bull's eye bearing are arranged on both sides of the adjusting piece. The cross-section of the adjusting piece at the support surface is in an I shape. The part without the support surface has a gap capable of accommodating the fixed side wall. The width of the adjusting piece is greater than the width of the corresponding adjusting groove. A sealing structure is also arranged between the periphery of the adjusting groove and the adjusting piece. A drain pipe communicating with the constant pressure water storage tank is arranged on the adjusting piece. The transmission device is arranged at the top or bottom of the constant pressure water storage tank for driving the adjusting piece to slide up and down along the adjusting groove.

2. The small-flow emitter flow rate test platform according to claim 1, characterized in that: Two adjusting grooves are arranged on the constant pressure water storage tank, respectively located on the left and right sides of the fixed side wall. The left adjusting groove extends upward from the bottom of the water storage tank to half of the height of the water storage tank, and the right adjusting groove extends from half of the height of the water storage tank to the top of the water storage tank; the transmission device corresponding to the left adjusting piece is arranged at the bottom of the constant pressure water storage tank, and the transmission device corresponding to the right adjusting piece is arranged at the top of the constant pressure water storage tank.

3. A small-flow water emitter flow rate test platform according to claim 1, characterized in that: The constant pressure water storage tank is provided with an adjusting groove penetrating the fixed side wall up and down, and the overall cross-section of the adjusting piece is in an I shape.

4. A small-flow irrigation emitter flow rate test platform according to any one of claims 1-3, characterized in that: The transmission device has a housing, and a millimeter-level threaded micro rod is rotatably arranged inside. The nut on the threaded micro rod is fixedly connected to the corresponding adjusting piece. After the threaded micro rod rotates, it drives the adjusting piece to move up and down; during the up and down movement of the adjusting piece, the part located outside the constant pressure water storage tank can enter the housing of the transmission device.

5. The flow rate test platform for a small-flow water emitter according to claim 4, characterized in that: A driving mechanism is arranged inside the transmission device, and the driving mechanism is controlled by a remote data monitoring, analysis and control APP to realize the driving rotation of the threaded micro rod.

6. The small-flow water emitter flow rate test platform according to claim 4, characterized in that: An exhaust and silencing pipe is connected to the drain pipe through a drain pipe tee joint.

7. A small-flow water emitter flow rate test platform according to claim 1, characterized in that: The water conveyance pipeline system is provided with a plurality of flow measurement main pipelines arranged side by side. One end of the flow measurement main pipeline is communicated with the constant pressure water storage tank, and the other end is closed. Connecting hoses hanging naturally are connected to the flow measurement main pipeline at intervals, and the end of the connecting hose is connected to the small flow irrigation emitter or the material test shell.

8. A small-flow irrigation emitter flow rate test platform according to claim 7, characterized in that: The material test shell includes a cover body and a box body. The box body is in the shape of a hollow cylinder, and a circular protrusion for placing the test material is provided at its bottom. A pressing ring for pressing the test material is placed inside the box body. A plurality of radially protruding fixing blocks are evenly distributed along the circumferential direction on the inner circular surface of the pressing ring. A sealing water-stop rubber ring pressing on the test material is provided at the bottom of the pressing ring. The cover body and the box body are screwed tightly through thread fitting, and an interface connected to the connecting hose is provided on the cover body.

9. A small-flow water emitter flow rate test platform according to claim 1, characterized in that: The water collection, drainage and circulation system includes a water collection and drainage bucket, a drainage container, drainage branches, a drainage main stream, a return pool and a water pump; the water collection and drainage buckets are arranged one-to-one directly below the small-flow water emitter or the material test shell. A water level sensor is provided on the barrel wall of the water collection and drainage bucket, and a movable drainage bottom is provided at the bottom of the barrel; a drainage container is also provided at the bottom of the water collection and drainage bucket, and a drainage branch is provided directly below the water outlet of the drainage container. Each drainage branch communicates with the return pool through the drainage main stream. The drainage branches, the drainage main stream and the return pool are all arranged on the test bench serving as the base of the test platform. The water pump connects the return pool and the water pool of the water source system.

10. A small-flow irrigation emitter flow rate test platform according to claim 9, characterized in that: The movable drainage bottom is composed of two or more bottom plates movably installed at the bottom of the water collection and drainage bucket, and its opening or closing is controlled by a spring switch. The remote data monitoring, analysis and control APP controls the opening or closing of the spring switch according to the water level signal monitored by the water level sensor. After the bottom plates are reset, a water-stop seal is formed through the sealing structure between them.

11. A small-flow irrigation emitter flow rate test platform according to claim 9, characterized in that: The flow monitoring system includes a gravity sensor provided at the bottom of the water collection and drainage bucket. The cumulative weight of the water collection and drainage bucket is collected in real time through the gravity sensor to obtain the cumulative flow rate, and then the data is transmitted to the remote data monitoring, analysis and control APP through the wireless data collection and transmission device.

Images