摘要
设计了一种新型复合式吸肥装置,并对其吸肥性能进行检测,与传统单文丘里管进行对比以验证其可行性。试验结果表明:在吸肥初始阶段,复合式吸肥装置喉部真空负压随进出口压力差的增大而降低,吸肥流量增大。吸肥流量随真空负压的绝对值增大呈线性增大趋势;当进出口压力差达到0.28 MPa左右时,真空负压降到最低值而不再发生变化,与此同时吸肥流量达到最大值;与单文丘里管相比,复合式吸肥装置由于使用过程中压力损失及水头损失,其单管吸肥流量较单文丘里管吸肥流量略有减小,但由于吸肥管数的增加,吸肥量可成倍增加。因此,在复合式吸肥装置进口处调节进口压力变化,在0.02~0.28 MPa的正确进出口压力差工作区间下控制复合式吸肥装置,可达到精确施肥的目的。
A new compound suction fertilizer device based on Venturi principle was developed to improve the efficiency of fertilizer absorption. The new device was made up with one Venturi tube and a suction cavity. The size of Venturi tube was chosen according to the GB / T 2624—2006. The suction cavity was covered on the Venturi tube. The performance of new device was tested to compare with traditional equipment. The result showed that the vacuum negative pressure at throat of compound fertilizer suction device was decreased from zero to- 0. 71 MPa with the increase of pressure difference between inlet and outlet from 0. 02 MPa to 0. 32 MPa. Moreover,the absorption flux was increased linearly with the increase of absolute value of vacuum negative pressure. When the pressure difference between inlet and outlet reached 0. 28 MPa,the vacuum negative pressure was dropped to the lowest value of- 0. 71 MPa,and then the absorption flux reached its maximal value. The total amount of fertilizer could be increased by number of suction pipes,so that it can improve the efficiency by several times compared with the conventional single Venturi tube,although the single suction absorption flux of compound device wasslightly reduced due to the pressure loss. In conclusion,the new compound fertilizer suction device could be precisely changed by changing the inlet pressure when inlet and outlet pressure difference was between0. 02 MPa and 0. 28 MPa,which could be useful for precise control.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第S1期280-284,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金青年基金项目(31301240)
土壤植物机器系统技术国家重点实验室开放课题基金项目(2014SKL03)
关键词
复合式吸肥装置
文丘里
结构设计
性能检测
精确施肥
combined fertilizer absorption device
Venturi
structure design
performance test
precision fertilization
