Into Unscientific

  Chapter 109 is more than just the impeller

  In the long history of civilization in the world.

  Water source.

   is a key word that any civilization cannot do without.

  The waterwheels and water hammers in China, as well as the Archimedes screw pumps in the West, are all tools created by ancient people for water supply.

   But these tools count as one, not to mention their huge size, most of them also need to work in water sources.

  And their main purpose is actually to transport water from low places to high places.

  Throughout the entire history of the ancient world, there is almost no civilization that can realize the flat land transportation of water sources without the help of gravity.

  Whether it is the ancient city water supply system in Rome that shocked the world, or the Chang'an hydraulic facilities in the Tang Dynasty, in fact, it has nothing to do with peaceful water delivery.

  For example, the water supply system of Rome is composed of the Old Arnia Aqueduct, the New Agna Aqueduct, the Marzia Aqueduct, the Tapua Aqueduct, the Julius Aqueduct, the Vigo Aqueduct, the Antonia Aqueduct, and so on.

  The core technology of these waterways is the principle of siphon or connector, that is to say, there must be a height difference or liquid pressure.

   This is why the water introduced in Rome will be supplied to the fountain first, because you can't stop it at all.

  So it is true that Rome is rich in water supply resources, but this refers to the fountains and faucets that can be seen everywhere on the street, which are public facilities.

  Residents can go out to fetch water with a bucket, which is very convenient.

  The indoor and outdoor water supply are obviously two different things.

   Except for Augustus the Great who danced on the top of Palatino, even in Rome, few people could comfortably drink water at home.

  The same is true in the Tang Dynasty. The so-called convenience actually stops outside the door.

  So Xu Yun was very puzzled before, why can Lao Su use the water from the well in the main house?

  Whether it is the principle of siphon or connecter, there is obviously an unexplainable bug:

  That is, the amount of water poured is not enough.

  A water pipe that is more than 100 meters long and nearly 30 centimeters in diameter is enough to fill 1/15th of it with 20 barrels of water.

   At the same time, there is another critical issue, that is labor cost.

  In this era, the cost of a servant carrying a bucket for a hundred meters and back and forth ten times is not high.

   Therefore, the cost of the old Su Xu's choice must be low, that is, something that was tinkered with the mentality of "small cost but can save the servants a little work", otherwise it would be better to give a few cents more as a subsidy.

   Now with Zhang San's words, Xu Yun's doubts are finally resolved:

   Good guy, Lao Su actually made a self-priming pump out of tinkering!

  Self-priming pump is a self-priming centrifugal pump.

  The so-called self-priming means that it can automatically **** up water without adding water.

  It is similar to the nature of sitting on it and moving it by itself.

  Its working principle is to fill the pump casing with water before starting the pump. After starting, the impeller rotates at a high speed, so that the water in the impeller channel flows to the volute.

  At this time, a vacuum is formed at the inlet, so that the water inlet check door opens, and the air in the suction pipe enters the pump, and reaches the outer edge through the impeller channel.

  This kind of pump does not need to install a bottom valve, because generally the inlet of the self-priming pump has its own check valve, which is what we often call a one-way valve.

  In this way, after the pump stops, the liquid in the pump body cannot return to the original pool, and instead is stored in the pump body, so there is no need to add liquid when it is used for the second time.

  The principle is very simple and easy to understand.

  As for the appearance of the self-priming pump, you can imagine the air cannon in Doraemon:

   Magnify the air cannon about 1.5 times and then place a brick on any end, it is almost the same as a self-priming pump.

"its not right"

  Thinking about it, Xu Yun suddenly frowned, and asked Zhang San:

   "Third brother, how fast do you think the donkey is spinning?"

"what?"

   Zhang San opened his mouth in confusion, and subconsciously replied:

   "It's just an ordinary donkey pulling a mill, I guess it's slower than usual walking?"

  Xu Yun became more and more puzzled when he heard this.

  There are many kinds of local self-priming pumps, and the power source is generally electricity or high water pressure.

  In addition, the self-priming pump can also be operated by hand, pedal or even water hammer.

  But no matter which of the above modes, what is needed is an instantaneous power.

  Theoretically speaking, the work done by the donkey pulling the mill is sufficient, but the time is a bit long.

   is the unit time—for example, within one or two seconds, the power of the grinding machine seems not enough to make the impeller turn.

  Thinking of this, Xu Yun couldn't help but guess:

  The working principle of the self-priming pump is probably not as simple as the impeller pumping water.

  The morning meal time set by the Su Mansion for the servants is from 5:00 to 2:00, that is, from 6:00 am to 7:30 am.

  Each servant has a quarter of an hour to eat, that is, fifteen minutes.

  After eating morning food.

  Servants at the 'Qing' and 'Dai' levels can rest for another quarter of an hour, and then they need to do hard work, such as chopping firewood, running errands, delivering goods, and so on.

  For example, the unlucky Zhang San was sent by the old capital to a silk shop to pick up the goods.

  Servants above 'standing' can rest for a quarter of an hour, and the follow-up tasks are relatively easy.

  For example, accompany the sons and gentlemen in the mansion to play or go out in the courtyard, or follow the master's house to visit other mansions, or repair flowers and plants, etc.

  However, although Xu Yun is currently treated as a 'green'-level servant, he has not been assigned any tasks.

   I don’t know whether it’s because he doesn’t have much energy (he’s an actor after all) or because he’s not naturalized, but the boss’s attitude seems a bit subtle.

   All he said was to let him take care of himself as soon as possible, and just fetch water during the day.

  The rest are riddles such as 'Don't sit for a long time', 'Lie on your side as much as possible'.

Of course.

  The monitoring that should be given will not be relaxed.

   Accompanied by several servants who went to chop firewood, Xu Yun returned to his small courtyard again.

   crunch—

  Just entered the hospital.

  Xu Yun saw a blindfolded black donkey slowly pulling the millstone.

  The bottom of the millstone was simply remodeled. As the millstone rotated, a thick rope was continuously pulled from a certain direction in the corner of the wall, and tied to the stone support under the millstone in circles.

  Xu Yun thought for a moment when he saw this, then glanced at the servants accompanying him, turned around and walked towards the corner, the bells on his feet were still tinkling.

   Several servants did not stop him, but prepared the tools for work on their own.

   After all, the height of this courtyard wall is nearly one foot, and the next door is still the atrium of the mansion.

  As long as Xu Yun knows how to penetrate the wall, otherwise he has no possibility to escape under the eyes of everyone.

   Walking to the corner, Xu Yun saw a device similar to the size of a local computer host.

  The rope seen on the millstone was slowly pulled out from one side of this device.

   Other than that.

   This device is still making a rattling sound.

  This voice Xu Yun is not unfamiliar,

   seems like

   "Balance with hairspring?"

   Recommend a book by a friend, and see Yisijian's "I Will Bury the Gods", a book with a very delicate style of writing, so I reasonably suspect that Jianjian is a girl, known as Jianniang!

  (end of this chapter)