Automatic ventilation controller of vegetable greenhouse

Abstract

An automatic ventilation controller of a vegetable greenhouse relates to a ventilation door automatic controller. The automatic ventilation controller is mainly composed of a back cover, a face cover, an electronic element and a circuit board. A casing of the controller is formed by the back cover and the face cover, and the electronic element is installed on the circuit board installed in the casing of the controller. A local power supply circuit is formed by a rectifying transformer, a bridge rectifying circuit, a first filter capacitor, a stabilizing circuit and a second filter capacitor b. A ventilation door motor inching switch circuit a is formed by a charging resistor a, a delaying capacitor a, a not gate a, an NAND gate a, a not gate b, a switch triode a and a relay a. A ventilation door motor inching swith circuit b is formed by a charging resistor b, a delaying capacitor b, a not gate c, an NAND gate b, a not gate d, a switch triode d and a relay b. The automatic ventilation controller of the vegetable greenhouse is matched with an automatic ventilation assembly of the vegetable greenhouse in matching mode, and utilizes temperature difference inside and outside the vegetable greenhouse to cool by natural ventilation or preserve heat.

Description

technical field [0001] The invention relates to an electronic control device, in particular to an automatic controller for a damper. Background technique [0002] The vegetable greenhouse is a frame-covered structure with thermal insulation properties. Its appearance allows people to eat off-season vegetables and fruits. Generally, the vegetable greenhouse uses a bamboo structure or a steel structure frame, covered with one or more layers of thermal insulation plastic film, thus forming a greenhouse space. The outer film can well prevent the loss of carbon dioxide produced by the growth of vegetables inside, so that the shed has a good heat preservation effect. [0003] The current vegetable greenhouses do not have ventilation devices. When there is plenty of sunlight during the day, the temperature inside the vegetable greenhouses is too high, which is not conducive to the growth of fruits and vegetables. Often, the thermal insulation plastic film is removed for ventilati...

AI Technical Summary

Problems solved by technology

[0003] The current vegetable greenhouses do not have ventilation devices. When there is plenty of sunlight during the day, the temperature in the vegetable greenhouses is too high, which is not conducive to the growth of fruits and vegetables. Often, the thermal insulation plastic film is removed for ventilation and heat dissipation, and the plastic film is still covered before evening. This not only consumes a lot of manpower, but also easily causes damage to the plastic film or shortens the service life

Images