Automatic door unlocking greenhouses without electricity and batteries: opener miracle for truckers

Most truckers or holiday home owners have a hothouse. It's not often have to visit the country and monitor the plants in the greenhouse.

One day, my cucumber so lost. I left the city and came to the country through the week. I opened a greenhouse and saw the cucumber leaves cooked from the heat of the scorching sun. I was left without a crop. Sometimes simply forgotten to open the window.

Therefore, the wise men came up with a useful instrument, which I learned recently. For some, this is not news, but for me personally it is a useful device is a novelty.

The principle of operation of the automatic ventilator is simple. Hydraulic cylinder actuator is filled with liquid and at elevated temperature due to the expansion of the fluid cylinder rod extends.

If the outside temperature falls, the rod is pushed back. You do not need electricity for this device, which is very important for me. The instrument does not work even with batteries. It operates by adjusting the air temperature.

There are two types of devices: air and bimetallic. The first work through expansion of air, the latter - due to the two plates of metal, different coefficient of thermal expansion.

How widely will open windows depends on the temperature. If much hot, the valve will open to all. For example, if the temperature is 20, the shutter open half.

The apparatus can be adjusted. It is made of stainless steel and is suitable for the greenhouse vents or doors up to 15 kg. Now you can safely leave and are not afraid of the plants in the greenhouse.

By the way, Aliekspress seen such a device for 700 rubles, But you can find and cheaper. link I can not leave, it is prohibited here. If you decide to take, then type in the search: automatic ventilation for greenhouses. The device works properly and is really useful for gardeners.

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