Water and fertilizer integrated intelligent drip irrigation system utilizing piezoelectric pump principle and control method of water and fertilizer integrated intelligent drip irrigation system

Abstract

The invention discloses a water and fertilizer integrated intelligent drip irrigation system based on a piezoelectric pump principle and a control method thereof, particularly relates to the technical field of agricultural irrigation, and solves the technical problems of easy blockage, non-uniform drip irrigation amount and high production cost of drip flow, in-pipe water droppers or out-pipe water droppers used in the prior art. According to the technical scheme, a piezoelectric pump serves as a water dropper of the drip irrigation system, a driving source of the piezoelectric pump is located at a system terminal, the used water dropper is an original vortex-shaped linear valve piezoelectric pump, the working state of the piezoelectric pump can be changed by adjusting driving voltage, and switching between the valveless working state and the valveless working state of the piezoelectric pump is achieved; the problems of flow pipe blockage and non-uniform flow distribution of a traditional drip irrigation system can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural irrigation, and in particular to a water-fertilizer integrated intelligent drip irrigation system utilizing the principle of a piezoelectric pump and a control method thereof. Background Art

[0002] The integrated water and fertilizer drip irrigation technology can effectively improve the utilization rate of water and reduce the use of pesticides and fertilizers. It is of great significance to solve the problems of water and fertilizer resource waste, soil acidification, environmental pollution, etc. In the traditional drip irrigation system, there is a certain distance between the water source and the dripper. The water-fertilizer mixture will experience pressure decay when flowing to the dripper, resulting in different drip irrigation amounts at different locations; the inner diameter of the dripper and the flow channel is usually small, and the flow tube will be blocked due to the deposition of inorganic salts during operation; in addition, there is a long distance between the dripper at the end of the system and the driving element, and a larger power source system is required to work normally, which not only makes the system more complicated, but also increases the manufacturing cost of the system.

[0003] According to the structure of the dripper, it can be divided into in-tube dripper and out-tube dripper. In-tube dripper mainly adopts a labyrinth structure to weaken the kinetic energy of the fluid, so as to achieve the purpose of drip flow. Out-tube dripper changes the flow surface by built-in diaphragm to achieve the purpose of weakening the kinetic energy of the fluid, thereby achieving drip flow. Both in-tube dripper and out-tube dripper have problems such as easy clogging, uneven drip irrigation volume, and high production cost, which seriously restrict the further promotion and application of drip irrigation technology.

[0004] In recent years, with the continuous development of piezoelectric pumps, they have gradually been applied to chip cooling, aerospace, chemical analysis and other fields. Piezoelectric pumps have the advantages of low energy consumption, high stability, low production cost and simple structure. If piezoelectric pumps are placed at the terminal of the water-fertilizer integrated drip irrigation system as drippers, they can completely solve the problems of easy clogging, uneven drip irrigation volume and high production cost of traditional drip irrigation equipment. Summary of the invention

[0005] Therefore, the present invention solves the technical problems of easy clogging, uneven drip irrigation volume and high production cost in the drip irrigation used in the prior art, whether it is an in-tube dripper or an out-tube dripper; the present invention provides a water-fertilizer integrated intelligent drip irrigation system and a control method thereof using the piezoelectric pump principle, in which the piezoelectric pump is used as the dripper of the drip irrigation system, and its driving source is located at the system terminal, which can effectively solve the problems of flow tube clogging and uneven flow distribution in the traditional drip irrigation system.

[0006] The present invention provides a water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle, comprising a photovoltaic circuit board and a controller, a first piezoelectric pump driving circuit board, a first piezoelectric pump, a second piezoelectric pump driving circuit board, a second piezoelectric pump, a water storage tank, a fertilizer storage tank, a water-fertilizer mixing tank, a concentration sensor, a liquid level sensor, a third piezoelectric pump driving circuit board, a third piezoelectric pump, and a humidity sensor; the photovoltaic circuit board is connected to the controller;

[0007] Further, the photovoltaic circuit board and the controller are respectively connected to the first piezoelectric pump driving circuit board, the second piezoelectric pump driving circuit board, the third piezoelectric pump driving circuit board, the concentration sensor, the liquid level sensor and the humidity sensor; the first piezoelectric pump is respectively connected to the water storage tank and the water-fertilizer mixing tank through flow tubes, and the first piezoelectric pump driving circuit board is connected to the piezoelectric vibrator of the first piezoelectric pump; the second piezoelectric pump is respectively connected to the fertilizer storage tank and the water-fertilizer mixing tank through flow tubes, and the second piezoelectric pump driving circuit board is connected to the piezoelectric vibrator of the second piezoelectric pump; the third piezoelectric pump is respectively connected to the water-fertilizer mixing tank and the ground through flow tubes, and the third piezoelectric pump driving circuit board is connected to the piezoelectric vibrator of the third piezoelectric pump;

[0008] Further, one end of the concentration sensor is connected to the water-fertilizer mixing tank, and the other end is connected to the photovoltaic circuit board and the controller; one end of the liquid level sensor is connected to the water-fertilizer mixing tank, and the other end is connected to the photovoltaic circuit board and the controller; one end of the humidity sensor is connected to the ground, and the other end is connected to the photovoltaic circuit board and the controller; the first piezoelectric pump, the second piezoelectric pump and the third piezoelectric pump have the same structure;

[0009] Further, the piezoelectric pump is a vortex linear valve piezoelectric pump, including bolts, bolt washers, pump cover, vortex linear valve, valve seat, gasket, pump seat, nut, piezoelectric vibrator, gasket; the pump cover includes pump cover bolt holes, countersunk holes, and pump cover through holes; the vortex linear valve includes a valve plate and a positioner; the valve seat includes a vortex linear valve mounting groove and a seat body; the gasket includes a gasket bolt hole and a gasket through hole; the pump body includes an inlet pipe, an inlet water storage tank, an inlet flow channel, a pump seat bolt hole, a pump cavity, a valve seat mounting groove, an outlet flow channel, an outlet water storage tank, and an outlet pipe;

[0010] Furthermore, one end of the water inlet water storage tank is connected to the water inlet pipe, and the other end is connected to the water inlet flow channel; the other end of the water inlet flow channel is connected to the pump chamber; one end of the water outlet flow channel is connected to the pump chamber, and the other end is connected to the water outlet water storage tank; the other end of the water outlet water storage tank is connected to the water outlet pipe; the valve seat mounting grooves are located on both sides of the water inlet flow channel and the water outlet flow channel, and there are 4 in total, which are symmetrically distributed.

[0011] Furthermore, the vortex linear valve is installed in the valve seat, and the positioner is inserted into the vortex linear valve installation groove during installation; the seat body of the valve seat is installed in the valve seat installation groove, the vortex linear valves on both sides of the inlet flow channel are axially symmetrically distributed, and the vortex linear valves on both sides of the outlet flow channel are also axially symmetrically distributed; the directions of the vortex linear valves on the same side of the inlet flow channel and the outlet flow channel are consistent; the distance between the vortex linear valves on the same side of the flow channel is less than the deformation amount of failure of the two valves; the width of the valve plate of the vortex linear valve should be less than the width of the positioner; the vortex linear valve is made of elastic metal or non-metallic material.

[0012] During assembly, the gasket is placed above the pump body to seal the flow channel; the piezoelectric vibrator is placed above the gasket; the pump cover is installed above the piezoelectric vibrator; the gasket is located between the piezoelectric vibrator and the pump cover to play a sealing role; the center of the pump cavity on the pump body, the center of the gasket through hole on the gasket, the center of the piezoelectric vibrator, the center of the gasket, the countersunk hole on the pump cover and the center of the pump cover through hole are at the same position; the bolts pass through the pump seat bolt holes, the gasket bolt holes, the pump cover bolt holes and are assembled with nuts to play a clamping role; the bolt washers are located between the pump cover and the bolts to protect the pump cover.

[0013] The present invention also provides a control method for the water-fertilizer integrated intelligent drip irrigation system based on the piezoelectric pump principle.

[0014] S1: When the vortex linear valve piezoelectric pump is in a valveless piezoelectric pump state, the steps include:

[0015] S11: The driving voltage gradually increases, and the piezoelectric vibrator gradually bends upward from the equilibrium position to the limit position. At this time, the volume of the pump chamber is also gradually increasing, and the internal pressure decreases. The vortex linear valve at the valve seat inlet deforms inward, and the vortex linear valve at the valve seat outlet deforms outward. The fluid flows into the pump chamber from the water inlet flow channel and the water outlet flow channel respectively;

[0016] S22: The driving voltage gradually decreases, the piezoelectric vibrator gradually moves from the upper limit position to the equilibrium position, the pump chamber volume gradually decreases, the internal pressure continues to increase, the vortex linear valve at the valve seat inlet gradually recovers to the outside, and the vortex linear valve at the valve seat outlet gradually recovers to the inside. At this time, the fluid flows out of the pump chamber from the water inlet flow channel and the water outlet flow channel respectively;

[0017] S23: The driving voltage gradually increases, the piezoelectric vibrator gradually bends downward from the equilibrium position to the limit position, the volume of the pump chamber decreases continuously, the internal pressure gradually increases, the vortex linear valve at the valve seat inlet gradually deforms outward, and the vortex linear valve at the valve seat outlet gradually deforms inward, and the fluid flows out of the pump chamber from the water inlet flow channel and the water outlet flow channel respectively;

[0018] S24: the driving voltage gradually decreases, the piezoelectric vibrator gradually moves from the lower limit position to the equilibrium position, the pump chamber volume gradually increases, the internal pressure gradually decreases, the vortex linear valve at the valve seat inlet gradually recovers inward, and the vortex linear valve 33 at the valve seat 34 outlet gradually recovers outward, and the fluid flows into the pump chamber from the water inlet flow channel and the water outlet flow channel 6 respectively;

[0019] S2: When the vortex linear valve piezoelectric pump is in a valved piezoelectric pump state, the steps include:

[0020] S21: The driving voltage gradually increases, and the piezoelectric vibrator gradually bends upward from the equilibrium position to the limit position. At this time, the volume of the pump chamber is also gradually increasing, and the internal pressure decreases. The vortex linear valve at the valve seat inlet deforms inward, and the vortex linear valve at the valve seat outlet deforms outward until it is closed. The fluid can only flow into the pump chamber through the water inlet flow channel;

[0021] S22: The driving voltage gradually decreases, the piezoelectric vibrator gradually moves from the upper limit position to the equilibrium position, the pump chamber volume gradually decreases, the internal pressure continues to increase, the vortex linear valve at the valve seat inlet gradually recovers to the outside, and the vortex linear valve at the valve seat outlet gradually recovers to the inside, and the fluid flows out of the pump chamber from the outlet flow channel;

[0022] S23: The driving voltage gradually increases, the piezoelectric vibrator gradually bends downward from the equilibrium position to the limit position, the volume of the pump chamber decreases continuously, the internal pressure gradually increases, the vortex linear valve at the valve seat inlet gradually deforms outward until it is closed, and the vortex linear valve at the valve seat outlet gradually deforms inward, and the fluid can only flow out of the pump chamber through the outlet flow channel;

[0023] S24: The driving voltage gradually decreases, the piezoelectric vibrator gradually moves from the lower limit position to the equilibrium position, the pump chamber volume gradually increases, the internal pressure gradually decreases, the vortex linear valve at the valve seat inlet gradually recovers inward, and the vortex linear valve at the valve seat outlet gradually recovers outward, and the fluid flows into the pump chamber from the water inlet flow channel.

[0024] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0025] 1. The present invention provides a water-fertilizer integrated intelligent drip irrigation system and its control method using the piezoelectric pump principle. The vortex linear valve piezoelectric pump is placed at the end of the water-fertilizer integrated intelligent drip irrigation system as a dripper, which can effectively solve the problems of blockage, uneven drip irrigation, high energy consumption, etc. of the traditional drip irrigation system; the solar photovoltaic technology is used to provide a power source for the drip irrigation system, which can effectively save energy. At the same time, the simple system structure can significantly reduce production costs.

[0026] 2. The water-fertilizer integrated intelligent drip irrigation system and its control method using the piezoelectric pump principle provided by the present invention, the system uses a liquid level sensor to maintain the height of the liquid in the mixed tank unchanged, uses a concentration sensor to keep the concentration of the water-fertilizer mixture in the mixing tank unchanged, and uses a humidity sensor to achieve on-demand drip irrigation of the system. Compared with the traditional drip irrigation system, the present invention has higher stability and more efficient drip irrigation. In addition, the drip head of the present invention is divided into a vortex linear valve piezoelectric pump, which is an independently developed high-efficiency drive micro pump that can achieve efficient pumping of water and fertilizer mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of a water-fertilizer integrated intelligent drip irrigation system based on the piezoelectric pump principle of the present invention;

[0029] Figure 2 It is a schematic diagram of an explosion of the vortex linear valve piezoelectric pump of the present invention;

[0030] Figure 3 This is a structural diagram of the pump cover of the present invention;

[0031] Figure 4 This is an axonometric view of the vortex linear valve of the present invention;

[0032] Figure 5 This is a structural diagram of the valve seat of the present invention;

[0033] Figure 6 This is a structural diagram of the gasket described in the present invention;

[0034] Figure 7 This is a structural diagram of the pump seat shown in the present invention;

[0035] Figure 8 This is a working principle diagram of the vortex linear valve piezoelectric pump of the present invention in a valveless piezoelectric pump state;

[0036] Fig. 9 This is a working principle diagram of the vortex linear valve piezoelectric pump in the present invention when it is in a valved piezoelectric pump state.

[0037] Description of reference numerals:

[0038] 1. Controller; 2. First piezoelectric pump drive circuit board; 3. First piezoelectric pump; 4. Second piezoelectric pump drive circuit board; 5. Second piezoelectric pump; 6. Water storage tank; 7. Fertilizer storage tank; 8. Water-fertilizer mixing tank; 9. Concentration sensor; 10. Liquid level sensor; 11. Third piezoelectric pump drive circuit board; 12. Third piezoelectric pump; 13. Humidity sensor; 30. Bolt; 31. Bolt washer; 32. Pump cover; 33. Vortex linear valve; 34. Valve seat; 35. Gasket; 36. Pump body; 37. Nut; 38. Piezoelectric vibrator; 39, gasket; 320, pump cover bolt hole; 321, countersunk hole; 322, pump cover through hole; 330, valve plate; 331, positioner; 340, vortex linear valve mounting groove; 341, seat body; 350, gasket bolt hole; 351, gasket through hole; 360, water inlet pipe; 361, water inlet water storage tank; 362, water inlet flow channel; 363, pump seat bolt hole; 364, pump chamber; 365, valve seat mounting groove; 366, water outlet flow channel; 367, water outlet water storage tank; 368, water outlet pipe. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Embodiment 1:

[0041] This embodiment provides a water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle. Figure 1 As shown, it includes a photovoltaic circuit board and controller 1, a first piezoelectric pump driving circuit board 2, a first piezoelectric pump 3, a second piezoelectric pump driving circuit board 4, a second piezoelectric pump 5, a water storage tank 6, a fertilizer storage tank 7, a water-fertilizer mixing tank 8, a concentration sensor 9, a liquid level sensor 10, a third piezoelectric pump driving circuit board 11, a third piezoelectric pump 12, and a humidity sensor 13.

[0042] The controller 1 is respectively connected to the first piezoelectric pump driving circuit board 2, the second piezoelectric pump driving circuit board 4, the third piezoelectric pump driving circuit board 11, the concentration sensor 9, the liquid level sensor 10 and the humidity sensor 13. The first piezoelectric pump 3 is respectively connected to the water storage tank 6 and the water-fertilizer mixing tank 8 through flow tubes, and the first piezoelectric pump driving circuit board 2 is connected to the first piezoelectric pump 3; the second piezoelectric pump 5 is respectively connected to the fertilizer storage tank 7 and the water-fertilizer mixing tank 8 through flow tubes, and the second piezoelectric pump driving circuit board 4 is connected to the second piezoelectric pump 5; the third piezoelectric pump 12 is respectively connected to the water-fertilizer mixing tank 8 and the ground through flow tubes, and the output port of the third piezoelectric pump 12 leads to the ground to irrigate the ground. A single drip irrigation system can be connected to multiple third piezoelectric pumps 12 through flow tubes to replace drippers to ensure the irrigation area, and the third piezoelectric pump driving circuit board 11 is connected to the third piezoelectric pump 12. One end of the concentration sensor 9 is connected to the water-fertilizer mixing tank 8, and the other end is connected to the controller 1; one end of the liquid level sensor 10 is connected to the water-fertilizer mixing tank 8, and the other end is connected to the controller 1; one end of the humidity sensor 13 is connected to the ground, and the other end is connected to the controller 1.

[0043] The first piezoelectric pump driving circuit board 2 is used to drive the first piezoelectric pump 3; the second piezoelectric pump driving circuit board 4 is used to drive the second piezoelectric pump 5, and the third piezoelectric pump driving circuit board 11 is used to drive the third piezoelectric pump 12. A photovoltaic circuit board can also be provided to convert solar energy for use by other components. The controller 1 drives the first piezoelectric pump driving circuit board 2, the second piezoelectric pump driving circuit board 4 and the third piezoelectric pump driving circuit board 11, and collects feedback signals from the concentration sensor 9, the liquid level sensor 10 and the humidity sensor 13.

[0044] The concentration sensor 9 is used to detect the concentration of the water-fertilizer mixture in the water-fertilizer mixing tank 8. When the concentration of the water-fertilizer mixture changes, the concentration sensor 9 will send a signal and transmit the signal to the controller 1. The controller 1 will send an adjustment signal to the second piezoelectric pump driving circuit board 4 to adjust the driving signal of the second piezoelectric pump driving circuit board 4, thereby changing the flow rate of the second piezoelectric pump 5 to adjust the concentration of the water-fertilizer mixture.

[0045] The liquid level sensor 10 is used to detect the liquid level of the water-fertilizer mixture in the water-fertilizer mixing tank 8 to ensure that the pressure difference of the third piezoelectric pump 12 is stable; when the liquid level of the water-fertilizer mixture changes, the liquid level sensor 10 will send a signal and transmit the signal to the controller 1, and the controller 1 will simultaneously send an adjustment signal to the first piezoelectric pump drive circuit board 2 and the second piezoelectric pump drive circuit board 4 to adjust the drive signals of the first piezoelectric pump drive circuit board 2 and the second piezoelectric pump drive circuit board 4, thereby changing the flow rate of the first piezoelectric pump 3 and the second piezoelectric pump 5, so as to achieve the purpose of controlling the liquid level.

[0046] The humidity sensor 13 is used to detect the water content in the ground soil. When the water content in the soil changes, the humidity sensor 13 will send a signal and transmit the signal to the controller 1. The controller 1 will send an adjustment signal to the third piezoelectric pump driving circuit board 11, thereby changing the flow rate of the third piezoelectric pump 12, so as to achieve the stability of the water and fertilizer content in the ground soil.

[0047] The first piezoelectric pump 3 , the second piezoelectric pump 5 and the third piezoelectric pump 12 have the same structure.

[0048] like Figure 2 The figure shows the dripper vortex linear valve piezoelectric pump of the drip irrigation system of the present invention, including bolts 30, bolt washers 31, pump cover 32, vortex linear valve 33, valve seat 34, gasket 35, pump body 36, nut 37, piezoelectric vibrator 38, and gasket 39.

[0049] like Figure 3 The pump cover 32 of the present invention is shown, including a pump cover bolt hole 320 , a countersunk hole 321 , and a pump cover through hole 322 .

[0050] like Figure 4 The spiral linear valve 33 of the present invention is shown, including a valve plate 330 and a positioner 331 .

[0051] like Figure 5 The valve seat 34 of the present invention is shown, which includes a spiral linear valve mounting groove 340 and a seat body 341 .

[0052] like Figure 6 The figure shows the gasket 35 of the present invention, which includes a gasket bolt hole 350 and a gasket through hole 351 .

[0053] like Figure 7 The figure shows the pump body 36 described in the present invention, including an inlet pipe 360, an inlet water storage tank 361, an inlet flow channel 362, a pump seat bolt hole 363, a pump chamber 364, a valve seat mounting groove 365, an outlet flow channel 366, an outlet water storage tank 367, and an outlet pipe 368; one end of the inlet water storage tank 361 is connected to the inlet pipe 360, and the other end is connected to the inlet flow channel 362; the other end of the inlet flow channel 362 is connected to the pump chamber 364; one end of the outlet flow channel 366 is connected to the pump chamber 364, and the other end is connected to the outlet water storage tank 367; the other end of the outlet water storage tank 367 is connected to the outlet pipe 368; the valve seat mounting grooves 365 are located on both sides of the inlet flow channel 362 and the outlet flow channel 366, and there are 4 of them in total, which are symmetrically distributed.

[0054] The vortex linear valve 33 is installed in the valve seat 34, and the positioner 331 is inserted into the vortex linear valve installation groove 340 during installation; the seat body 341 of the valve seat 34 is installed in the valve seat installation groove 365, the vortex linear valves 33 on both sides of the water inlet flow channel 362 are axially symmetrically distributed, and the vortex linear valves 33 on both sides of the water outlet flow channel 366 are also axially symmetrically distributed; the directions of the vortex linear valves 33 on the same side of the water inlet flow channel 362 and the water outlet flow channel 366 are consistent; the distance between the vortex linear valves 33 on the same side of the flow channel is less than the deformation amount of the two valves failing; the width of the valve plate 330 of the vortex linear valve 33 should be less than the width of the positioner 331; the vortex linear valve 33 is made of elastic metal or non-metallic material.

[0055] During assembly, the gasket 35 is placed above the pump body 36 to seal the flow channel; the piezoelectric vibrator 38 is placed above the gasket 35; the pump cover 32 is installed above the piezoelectric vibrator 38; the gasket 39 is located between the piezoelectric vibrator 38 and the pump cover 32 to play a sealing role; the center of the pump cavity 364 on the pump body 36, the center of the gasket through hole 351 on the gasket 35, the center of the piezoelectric vibrator 38, the center of the gasket 39, the countersunk hole 321 on the pump cover 32 and the center of the pump cover through hole 322 are at the same position; the bolt 30 passes through the pump seat bolt hole 363, the gasket bolt hole 350, the pump cover bolt hole 320 and is assembled with the nut 37 to play a clamping role; the bolt washer 31 is located between the pump cover 32 and the bolt 30 to protect the pump cover 32.

[0056] Embodiment 2:

[0057] This embodiment provides a control method for the water-fertilizer integrated intelligent drip irrigation system based on the above-mentioned piezoelectric pump principle, wherein one operation cycle of the pump is T;

[0058] like Figure 8 The figure shows the working principle diagram of the vortex linear valve piezoelectric pump of the present invention in the valveless piezoelectric pump state. At this time, the working process of the vortex linear valve piezoelectric pump is as follows:

[0059] In the 0-T / 4 period, the driving voltage gradually increases, and the piezoelectric vibrator 38 gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber 364 is also gradually increasing, and the internal pressure decreases. The vortex linear valve 33 at the inlet of the valve seat 34 deforms inward, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms outward, and the fluid flows into the pump chamber 364 from the inlet flow channel 362 and the outlet flow channel 366 respectively.

[0060] During the T / 4-T / 2 period, the driving voltage gradually decreases, the piezoelectric vibrator 38 gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber 364 gradually decreases, the internal pressure continues to increase, the vortex linear valve 33 at the inlet of the valve seat 34 gradually recovers to the outside, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually recovers to the inside. At this time, the fluid flows out of the pump chamber 364 from the inlet flow channel 362 and the outlet flow channel 366 respectively.

[0061] In the T / 2-3T / 4 period, the driving voltage gradually increases, the piezoelectric vibrator 38 gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber 364 continues to decrease, the internal pressure gradually increases, the vortex linear valve 33 at the inlet of the valve seat 34 gradually deforms outward, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually deforms inward, and the fluid flows out of the pump chamber 364 from the inlet flow channel 362 and the outlet flow channel 366 respectively.

[0062] In the 3T / 4-1T cycle, the driving voltage gradually decreases, the piezoelectric vibrator 38 gradually moves from the lower limit position to the equilibrium position, the pump chamber volume gradually increases, the internal pressure gradually decreases, the vortex linear valve 33 at the inlet of the valve seat 34 gradually recovers inward, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually recovers outward, and the fluid flows into the pump chamber from the inlet flow channel 362 and the outlet flow channel 366 respectively.

[0063] The piezoelectric vibrator 38 Figure 8 During the movement from S4→S1→S2 as marked in the figure, the volume of the pump chamber 364 increases, and negative pressure appears inside the pump chamber 364. At this time, the vortex linear valve 33 at the inlet of the valve seat 34 deforms inwardly, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms outwardly. The fluid flows into the pump chamber 364 through the water inlet flow channel 362 and the water outlet flow channel 366. This is the suction stage of the piezoelectric pump. Since the vortex linear valve 33 at the inlet deforms inwardly, the cross-section of the fluid entering the pump chamber 364 increases, and the vortex linear valve 33 at the outlet deforms outwardly, the cross-section of the fluid entering the pump chamber 364 decreases. Therefore, the volume of the fluid entering the pump chamber 364 from the water inlet flow channel 362 during the suction stage is larger than that at the water outlet flow channel 366. The piezoelectric vibrator 38 moves along the water inlet flow channel 362. Figure 8During the movement of S2→S3→S4 marked in the figure, the volume of the pump chamber 364 decreases, and the internal pressure of the pump chamber 364 increases. At this time, the vortex linear valve 33 at the inlet of the valve seat 34 deforms outward, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms inward. The liquid flows out of the pump chamber 364 from the water inlet channel 362 and the water outlet channel 366 respectively. This is the scheduling stage of the pump. Since the vortex linear valve 33 at the inlet deforms outward, the cross-section of the fluid flowing out of the pump chamber 364 decreases, and the vortex linear valve 33 at the outlet deforms inward, the cross-section of the fluid flowing out of the pump chamber 364 increases. Therefore, the volume of the pump chamber 364 flowing out of the water outlet channel 366 during the scheduling stage is greater than the volume of the pump chamber 364 flowing out of the water inlet channel 362. In summary, when the piezoelectric pump is in the valveless piezoelectric pump working state, the liquid can achieve unidirectional flow from the water inlet pipe 360 ​​to the water outlet pipe 368.

[0064] like Fig. 9 The figure shows the working principle diagram of the vortex linear valve piezoelectric pump of the present invention in the state of a valved piezoelectric pump. At this time, the working process of the vortex linear valve piezoelectric pump is as follows:

[0065] In the 0-T / 4 cycle, the driving voltage gradually increases, and the piezoelectric vibrator 38 gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber 364 is also gradually increasing, and the internal pressure decreases. The vortex linear valve 33 at the inlet of the valve seat 34 deforms inward, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms outward until it is closed. The fluid can only flow into the pump chamber 364 through the water inlet channel 362.

[0066] During the T / 4-T / 2 period, the driving voltage gradually decreases, the piezoelectric vibrator 38 gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber 364 gradually decreases, the internal pressure continues to increase, the vortex linear valve 33 at the inlet of the valve seat 34 gradually recovers to the outside, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually recovers to the inside. At this time, the fluid flows out of the pump chamber 364 from the outlet channel 366.

[0067] In the T / 2-3T / 4 period, the driving voltage gradually increases, the piezoelectric vibrator 38 gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber 364 continues to decrease, the internal pressure gradually increases, the vortex linear valve 33 at the inlet of the valve seat 34 gradually deforms outward until it is closed, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually deforms inward, and the fluid can only flow out of the pump chamber 364 through the outlet channel 366.

[0068] In the 3T / 4-1T cycle, the driving voltage gradually decreases, the piezoelectric vibrator 38 gradually moves from the lower limit position to the equilibrium position, the volume of the pump chamber 364 gradually increases, the internal pressure gradually decreases, the vortex linear valve 33 at the inlet of the valve seat 34 gradually recovers inward, and the vortex linear valve 33 at the outlet of the valve seat 34 gradually recovers outward, and the fluid flows into the pump chamber 364 from the water inlet channel 362.

[0069] The piezoelectric vibrator 38 Fig. 9 When the movement is from S8 to S5 to S6 as marked in the figure, the volume of the pump chamber 364 increases, and negative pressure appears inside the pump chamber 364. At this time, the vortex linear valve 33 at the inlet of the valve seat 34 deforms inwardly, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms outwardly until it is closed. The fluid can only flow into the pump chamber 364 through the water inlet flow channel 362, which is the suction stage of the piezoelectric pump; the piezoelectric vibrator 38 moves along the water inlet flow channel 362. Fig. 9 During the movement from S6 to S7 to S8 as marked in the figure, the volume of the pump chamber 364 decreases, and the pressure inside the pump chamber increases. At this time, the vortex linear valve 33 at the inlet of the valve seat 34 deforms outward until it is closed, and the vortex linear valve 33 at the outlet of the valve seat 34 deforms inward, and the liquid can only flow out of the pump chamber 364 through the outlet flow channel 366, which is the scheduling stage of the pump. In summary, when the piezoelectric pump is in the working state of the piezoelectric pump with valve, the liquid can realize unidirectional flow from the inlet to the outlet.

[0070] The dripper vortex linear valve piezoelectric pump 3 of the drip irrigation system of the present invention can realize unidirectional flow of liquid whether in a valveless working state or a valved working state. When the vortex linear valve piezoelectric pump 3 is in a valveless working state, there is a backflow phenomenon, and its pump flow rate is less than that in a valved working state.

[0071] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle, characterized in that: The invention comprises a water-fertilizer mixing tank (8), beside which a water storage tank (6) and a fertilizer storage tank (7) are arranged; the water storage tank (6) and the fertilizer storage tank (7) are respectively connected to the input ends of a first piezoelectric pump (3) and a second piezoelectric pump (4); the output ends of the first piezoelectric pump (3) and the second piezoelectric pump (4) are connected to the inside of the water-fertilizer mixing tank (8); and the inside of the water-fertilizer mixing tank (8) is connected to the input end of a third piezoelectric pump (12).

2. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 1 is characterized in that: The signal input ends of the first piezoelectric pump (3), the second piezoelectric pump (4) and the third piezoelectric pump (12) are respectively connected to the signal output ends of the first piezoelectric pump driving circuit board (2), the second piezoelectric pump driving circuit board (4) and the third piezoelectric pump driving circuit board (11); and the signal input ends of the first piezoelectric pump driving circuit board (2), the second piezoelectric pump driving circuit board (4) and the third piezoelectric pump driving circuit board (11) are all connected to the signal output end of the controller (1).

3. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 2 is characterized in that: The water-fertilizer mixing tank (8) is provided with a concentration sensor (9) and a liquid level sensor (10); the signal output ends of the concentration sensor (9) and the liquid level sensor (10) are connected to the signal receiving end of the controller (1).

4. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 3 is characterized in that: The signal receiving end of the controller (1) is also connected to a humidity sensor (13), and the humidity sensor (13) is arranged below the ground.

5. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 4 is characterized in that: The third piezoelectric pump comprises a pump body (36), a pump chamber (364) is provided in the middle of the pump body (36); a water inlet channel (362) and a water outlet channel (366) are provided on both sides of the pump chamber (364); a water inlet water storage tank (361) and a water outlet water storage tank (367) are provided on the side of the water inlet channel (362) and the water outlet channel (366) away from the pump chamber (364); the water inlet water storage tank (361) and the water outlet water storage tank (367) are respectively connected to the water inlet pipe (360) and the water outlet pipe (368); and valve seat mounting grooves (365) are provided on the front and rear sides of the water inlet channel (362) and the water outlet channel (366).

6. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 5 is characterized in that: A gasket (35) is arranged above the pump body (36), and a pump cover (32) is arranged above the gasket (35); a pump cover through hole (322) and a gasket through hole (351) are respectively provided in the middle of the pump cover (32) and the gasket (35); a countersunk hole (321) concentric with the pump cover through hole (322) is provided on the pump cover (32); a piezoelectric vibrator (38) is arranged between the gasket (35) and the pump cover (32), and a gasket (39) is arranged between the piezoelectric vibrator (38) and the pump cover (35).

7. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 6 is characterized in that: The valve seat installation groove (365) is connected to a vortex linear valve (33) via a valve seat (34).

8. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 7 is characterized in that: The valve seat (34) comprises a seat body (341) and a spiral linear valve installation groove (340) provided on the seat body (341).

9. The water-fertilizer integrated intelligent drip irrigation system using the piezoelectric pump principle according to claim 8 is characterized in that: The pump cover (32), gasket (35) and pump body (36) are respectively provided with a plurality of pump cover bolt holes (320), gasket bolt holes (350) and pump seat bolt holes (363); the pump cover (32), gasket (35) and pump body (36) are connected via bolts (30) and nuts (37); the first piezoelectric pump (3) and the second piezoelectric pump (5) have the same structure as the third piezoelectric pump (12).

10. A control method for a water-fertilizer integrated intelligent drip irrigation system using a piezoelectric pump principle based on any one of claims 1 to 9, characterized in that: S1: When the vortex linear valve piezoelectric pump is in a valveless piezoelectric pump state, the steps include: S11: the driving voltage gradually increases, and the piezoelectric vibrator (38) gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber (364) also gradually increases, the internal pressure decreases, the vortex linear valve (33) at the inlet of the valve seat (34) deforms inward, and the vortex linear valve (33) at the outlet of the valve seat (34) deforms outward, and the fluid flows into the pump chamber (364) from the water inlet flow channel (362) and the water outlet flow channel (366) respectively; S22: the driving voltage gradually decreases, the piezoelectric vibrator (38) gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber (364) gradually decreases, the internal pressure continues to increase, the vortex linear valve (33) at the inlet of the valve seat (34) gradually recovers to the outside, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually recovers to the inside, and at this time, the fluid flows out of the pump chamber (364) from the water inlet flow channel (362) and the water outlet flow channel (366) respectively; S23: the driving voltage gradually increases, the piezoelectric vibrator (38) gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber (364) continuously decreases, the internal pressure gradually increases, the vortex linear valve (33) at the inlet of the valve seat (34) gradually deforms outward, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually deforms inward, and the fluid flows out of the pump chamber (364) through the water inlet flow channel (362) and the water outlet flow channel (366) respectively; S24: the driving voltage gradually decreases, the piezoelectric vibrator (38) gradually moves from the lower limit position to the equilibrium position, the volume of the pump chamber (364) gradually increases, the internal pressure gradually decreases, the vortex linear valve (33) at the inlet of the valve seat (34) gradually recovers inward, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually recovers outward, and the fluid flows into the pump chamber (364) from the water inlet flow channel (362) and the water outlet flow channel (366) 6 respectively; S2: When the vortex linear valve piezoelectric pump is in a valved piezoelectric pump state, the steps include: S21: The driving voltage gradually increases, and the piezoelectric vibrator (38) gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber (364) also gradually increases, and the internal pressure decreases. The vortex linear valve (33) at the inlet of the valve seat (34) deforms inward, and the vortex linear valve (33) at the outlet of the valve seat (34) deforms outward until it is closed. The fluid can only flow into the pump chamber (364) through the water inlet flow channel (362); S22: the driving voltage gradually decreases, the piezoelectric vibrator (38) gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber (364) gradually decreases, the internal pressure continues to increase, the vortex linear valve (33) at the inlet of the valve seat (34) gradually recovers to the outside, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually recovers to the inside, and at this time, the fluid flows out of the pump chamber (364) from the outlet flow channel (366); S23: the driving voltage gradually increases, the piezoelectric vibrator (38) gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber (364) continuously decreases, the internal pressure gradually increases, the vortex linear valve (33) at the inlet of the valve seat (34) gradually deforms outward until it is closed, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually deforms inward, and the fluid can only flow out of the pump chamber (364) through the outlet flow channel (366); S24: The driving voltage gradually decreases, the piezoelectric vibrator (38) gradually moves from the lower limit position to the equilibrium position, the volume of the pump chamber (364) gradually increases, the internal pressure gradually decreases, the vortex linear valve (33) at the inlet of the valve seat (34) gradually recovers inward, and the vortex linear valve (33) at the outlet of the valve seat (34) gradually recovers outward, and the fluid flows into the pump chamber (364) from the water inlet flow channel (362).

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