Venturi variable fertilization device and control method based on pwm
The technology of a fertilization device and a control method is applied to the pressure spreading method of liquid fertilizer, program control, computer control, etc., and can solve the problems of difficult popularization and application, low cost performance, inconvenience of automatic quantitative adjustment of fertilization concentration, etc., and achieves a simple structure. , the effect of low cost
Inactive Publication Date: 2011-12-21
SOUTH CHINA AGRI UNIV
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[0008] To sum up, the shortcomings of the current micro-irrigation and fertilization field are that the cost performance is not high, it is difficult to popularize and apply, or it is inconvenient to automatically and quantitatively adjust the fertilization concentration
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[0029] The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the invention are not limited thereto.
[0030] like figure 1 Described, a kind of Venturi variable fertilization device based on PWM, comprises main water pipe 1 and the Venturi fertilizer 2 that is arranged on it, the pressure transmitter 3 that can detect the inlet hydraulic pressure of Venturi fertilizer, solenoid valve 5, 6. Controller 4 and liquid fertilizer tank 7. The pressure transmitter 3 and the solenoid valves 5 and 6 are all arranged on the main water pipe 1 . The solenoid valve includes a first solenoid valve 5 and a second solenoid valve 6 , the first solenoid valve 5 is arranged on the main water pipe 1 of the corresponding Venturi fertilizer applicator 2 , and the second solenoid valve 6 is arranged at the outlet end of the main water pipe 1 . The liquid fertilizer tank 7 is connected with the fertilizer...
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The invention discloses a Venturi variable fertilization device and a control method based on pulse width modulation (PWM). The device comprises a main water pipe and a Venturi fertilizer applicator arranged on the main water pipe, and also comprises a pressure transmitter, an electromagnetic valve and a controller, wherein the pressure transmitter is capable of detecting the water pressure of the inlet of the Venturi fertilizer applicator; the pressure transmitter and the electromagnetic valve are respectively arranged on the main water pipe; the controller comprises a signal conditioning circuit, an electromagnetic valve driving circuit, a singlechip and a power circuit which is used for supplying power to the singlechip; the signal input end of the signal conditioning circuit is connected with the pressure transmitter; the signal output end of the signal conditioning circuit is connected with the signal input end of the singlechip; the signal output end of the singlechip is connected with the signal input end of the electromagnetic valve driving circuit; and the signal output end of the electromagnetic valve driving circuit is connected with electromagnetism. By adopting the device, the controller is capable of controlling the electromagnetic valve through a PWM technology. The device has a simple structure and low cost. Moreover, a battery is mainly applied to supply the power to all components, thus, the device is convenient and flexible. Further, the device and the control method are capable of identifying a fertilization state required by the outside through a wireless mode, and moreover, the device and the control method are capable of automatically and quantitatively adjusting the fertilization concentration, but are not influenced by the water flow of a waterinlet, therefore, the device and the control method are worthy of being popularized.
Description
technical field [0001] The patent of the invention relates to the field of agricultural water-saving irrigation and fertilization, in particular to a PWM-based Venturi variable fertilization device and control method. Background technique [0002] With the development of agricultural modernization, the importance of micro-irrigation systems in the development of facility agriculture, water-saving agriculture and ecological agriculture has become increasingly prominent. The integration of micro-irrigation and fertilization systems is an important technical means for high-yield, high-efficiency and high-quality crops. [0003] At present, the fertilization methods commonly used in micro-irrigation systems at home and abroad include electric fertilizer injection pumps, hydraulically driven proportional fertilization pumps, differential pressure fertilization tanks, and Venturi fertilizer applicators. [0004] The electric fertilizer injection pump has the advantage of uniform ...
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IPC IPC(8): A01C23/04G05B19/042
Inventor 洪添胜李加念冯瑞珏岳学军陈姗温威
Owner SOUTH CHINA AGRI UNIV