Automatic control system for concentration of carbon dioxide in greenhouse

Abstract

The invention discloses an automatic control system for the concentration of carbon dioxide in a greenhouse. The system comprises a monitoring module, a control module, a carbon dioxide gas storage tank and an air inflation pipeline; the monitoring module comprises a carbon dioxide concentration sensor and a wireless transmitter, wherein the carbon dioxide concentration sensor is connected with the wireless transmitter; the control module comprises a wireless receiver, a data processor, a controller, an electromagnetic valve and a fan, wherein the wireless receiver is connected with the data processor, the data processor is connected with the controller, and the controller is connected with the fan and the electromagnetic valve; the carbon dioxide gas storage tank is arranged outside the greenhouse, and is connected into the greenhouse through the air inflation pipeline; and the electromagnetic valve is arranged at an outlet of the air inflation pipeline. Control is performed through real-time receiving and processing of the concentration information of the carbon dioxide, so that manual participation in the planting process of the greenhouse is greatly reduced, the maintenance cost of the growth environment of the greenhouse is reduced, and in comparison with manual control, the control is more rapid and effective.

Description

technical field [0001] The invention relates to an automatic control system of carbon dioxide concentration in a greenhouse. Background technique [0002] The existence of carbon dioxide is beneficial to the photosynthesis of plants, and it is one of the raw materials for photosynthesis of green plants. 95% of the dry weight of crops comes from photosynthesis. Cultivation in plastic greenhouses will keep the crops in a relatively closed place for a long time, and the carbon dioxide concentration in the greenhouse will vary greatly within a day, reaching a maximum value of 1000-1200ppm before sunrise, and falling to about 100ppm 2.5-3 hours after sunrise, which is only atmospheric The concentration is about 30%, and it has been maintained until 2 hours in the afternoon before it starts to rise, and it returns to the atmospheric level at about 4 pm. During normal growth, vegetables require a carbon dioxide concentration of generally 1000-1500ppm. Therefore, the concentration...

AI Technical Summary

Problems solved by technology

In the current technology, sensors and carbon dioxide generators are often placed in the greenhouse to control the carbon dioxide concentration inside the greenhouse, which will take up a large amount of space in the greenhouse, such as the technical solution of the Chinese patent (publication number CN103766165A), which not only The carbon dioxide generator and the sensing device are placed in the greenhouse at the same time, and a wireless radio frequency chip is used for transmission. The wireless radio frequency chip is not only difficult to adjust and maintain, but also the signal is easily interfered

In addition, in the current technology, the main means of controlling the carbon dioxide concentration in the greenhouse is to directly charge carbon dioxide gas into the greenhouse, such as the technical solution of the Chinese patent (publication number: CN106718346A), which only provides the charging of carbon dioxide and can only Increase the concentration of carbon dioxide in the greenhouse, but when the concentration of carbon dioxide is too high, such as at night, plants do not perform photosynthesis and consume carbon dioxide. At this time, the concentration of carbon dioxide is too high, but it will affect the normal respiration of plants and hinder their normal growth

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