Water content supply device for vegetable culture under spacial microgravity

Abstract

The invention discloses a water content supply device for vegetable culture under spacial microgravity, which is mainly used for providing high-efficiency water content supply for the vegetable culture in a long-time and remote-distance deep space manned space probe and in a space station where personnel stays for a long term. The device consists of a water tank, an enclosed cylinder, a culture module, a pressure sensor, a filter, a gas-liquid separator, a peristaltic pump and a programmable logic controller. The device can ensure to provide stable water content supply for vegetable culture under the spacial microgravity, and also has the advantages of degassing, purification, water saving, labor saving, simple and convenient operation and the like.

Description

technical field [0001] The invention relates to a water supply device for vegetable cultivation under space microgravity, which is mainly used for providing high-efficiency water supply for long-term and long-distance deep-space manned detection spacecraft and long-term manned stay in space station for vegetable cultivation. Background technique [0002] With the development of aviation life support technology, people are more and more aware of the importance of fresh green vegetables to the astronauts of deep space exploration spacecraft. Green vegetables can not only provide visual and psychological comfort to astronauts in a limited space, but more importantly, they can also provide astronauts with fresh green vitamins and biologically active substances to meet the physiological needs of the body and reduce the potential danger of taking synthetic vitamins. At present, the aerospace industry has gradually carried out research on fresh green vegetable supply devices for de...

AI Technical Summary

Problems solved by technology

The shortcomings of this water supply device based on signal feedback are mainly reflected in: ①Due to the disassembly of the module during harvest and the reassembly of the module during planting in the continuous cultivation process, the position or angle between the sensor contact and the environmental substrate changes, resulting in sensor signal output No repeatability; ②The output of the sensor is easily disturbed by the root system of the plant; ③Due to the capillary action of the cultivation substrate, the sensor output has a large hysteresis, which is prone to error signal output

④ Every time the harvest or matrix is ​​updated, the repeated installation of the sensor also increases the labor intensity of the astronauts

In addition, this kind of water supply device tends to make the cultivation substrate wet unevenly, and the water content of each place varies greatly, and the fluctuation range is relatively large.

Large fluctuations in the water content of the cultivation substrate will cause plants to suffer from drought and flood stress, increasing the occurrence of diseases and insect pests. At the same time, excessive water supply will easily cause nitrate nitrogen fertilizer to be leached out of the crop root zone, affecting the normal growth of plants.

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