Double-acting piston bellows is mainly a device to provide wind, which is provided by the fire of the furnace, and its main function is to make the furnace burn more vigorously. The ancients probably invented this kind of double-acting piston bellows in the Tang and Song Dynasties, and it has been used ever since, because this invention seems simple, but it is actually very practical. The double-hole piston bellows mainly has two clapboards, and the upper clapboard has a piston, which is connected with the wooden handle on the side and can be connected with the handle outside the double-hole piston bellows.
There is a clever device in it. People found some feathers in it, which can prevent the air from flowing out of the rectangular box. Its appearance is rectangular, and there are air inlets on both sides of the rectangular box. People can pull out the wooden handle with a handle on one side, so that the air will be sucked into the rectangular box from our environment, and then push the wooden handle in. When the wooden handle is pushed in, air will be sucked in from another place, so that the two processes are repeated all the time, and air can be continuously sent into the box.
And then use it in other places under pressure. After this kind of bellows was invented, it has been widely used in the people, and this kind of double-acting piston bellows will still be used in some rural families in the north today. Because this kind of bellows can make the fire in the stove more and more prosperous in a short time, and it doesn't take much energy, just push and pull the wooden handle on the bellows repeatedly. Double-acting piston bellows was invented by China's unique technology. In previous times, it was widely used because it could continuously provide wind and make the stove more efficient.
The above story only represents my personal opinion. Please forgive me if there is any mistake.