Automatic ventilation system of greenhouse

Abstract

The invention relates to the technical field of greenhouses, and discloses an automatic ventilation system of a greenhouse. The system comprises a closed container internal containing first fluid, a connecting pipe and a window opening mechanism. One end of the connecting pipe is communicated with the closed container, and the window opening mechanism is arranged at the other end of the connectingpipe and provided with a preset balance weight. The window opening mechanism can be driven through evaporation or boiling of the first fluid; when the temperature in the greenhouse reaches the presetwindow opening temperature, the window opening mechanism can be driven through evaporation or boiling of the first fluid, and then a ventilation window is opened; and when the temperature in the greenhouse is lower than the preset window opening temperature, the windowing opening mechanism is in a static state under the action of the gravity of the window opening mechanism. The automatic ventilation system has the advantages that the temperature change of the greenhouse is utilized, the first fluid is forced to be converted between the gas state and the liquid state, the pressure intensity ofthe closed container is changed, opening and closing of a skylight are achieved, electric drive is not needed, the temperature in the greenhouse can be correctly sensed, the ventilation effect is good, and the window opening flexibility is high.

Description

technical field [0001] The invention relates to the technical field of greenhouses, and relates to an automatic ventilation system of a greenhouse. Background technique [0002] Greenhouses need frequent ventilation, which has many beneficial effects on greenhouse vegetables and plants, such as cooling, dehumidification, regulating and supplementing carbon dioxide, and removing harmful gases. Especially in the hot summer, if there is no ventilation, strong solar radiation and greenhouse effect will not only make it difficult for crops to grow, but also a great physical limit test for the staff in the greenhouse. [0003] In the design of the existing greenhouse ventilation system, the traditional scheme is to control the opening and closing of the greenhouse ventilation window by controlling the forward and reverse rotation of the motor, but there are the following disadvantages: (1) A power supply system is required, and for some outdoor greenhouses The environment is inco...

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Problems solved by technology

Especially in the hot summer, if there is no ventilation, strong solar radiation and greenhouse effect will not only make it difficult for crops to grow, but also a great physiological limit test for the staff in the greenhouse

[0003] In the existing greenhouse ventilation system design, the traditional solution is to control the opening and closing of the greenhouse ventilation window by controlling the positive and negative rotation of the motor, but there are the following disadvantages: (1) A power supply system is required, and for some outdoor greenhouses The environment is inconvenient or the cost is too high; (2) there is no energy-saving advantage; (3) the reliability is poor, and the high-temperature and high-humidity environment in the field or in the greenhouse is not conducive to the use of electronic control; (4) the cost of the entire control device is too high, not promotional value

But the automatic ventilation device of this existing greenhouse still has the following technical problems: since the shape memory alloy piece is directly connected with the ventilation window and driven, where the ventilation window is arranged, the shape memory alloy piece is just arranged there; After the ventilation window is opened, the cool wind entering from the outside will first lower the temperature of the local area near the ventilation window, so that the shape memory alloy will sense the temperature drop, and will deform to close the ventilation window. The overall temperature has not dropped at all, making it difficult to achieve the desired ventilation effect

[0005] Moreover, in the automatic ventilation system of the existing greenhouse, the adjustability is low, and different plants require different temperatures in the greenhouse for cultivation, so the temperature of the windows of the greenhouse is also different, and it is difficult for the existing greenhouse to adapt This changing window opening temperature; the opening of the ventilation window cannot be adjusted or is difficult to adjust, and the sensitivity of the ventilation window opening are all problems to be solved

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