Into Unscientific

In the long history of civilization in the world.

source of water.

It 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 mostly to transport water from low places to high places.

Throughout the history of the ancient world, almost no civilization was able to transport water on flat ground without the use of gravity.

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

For example, Rome's water supply system is composed of the old Arnia waterway, the new Arnia waterway, the Marzia waterway, the Tapua waterway, the Julius waterway, the Vergo waterway, the Antonia waterway 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.

That's why the water introduced in Rome was first supplied to the fountain, because you can't stop it.

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 water supply inside and outside the house are obviously two different things.

Except for Augustus the Great who danced on the top of the Palatine, 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.

For a water pipe more than 100 meters long and nearly 30 centimeters in diameter, 20 barrels of water can fill one-fifteenth of it, which is considered too much.

At the same time, there is a very 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 plan chosen by old Su Xu 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, following Zhang San's words, Xu Yun's doubts were finally resolved:

Good guy, Lao Su actually tinkered with a self-priming pump!

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

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

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

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

At this time, the inlet forms a vacuum, 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 is stopped, the liquid in the pump body cannot return to the original pool and is instead 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 by about 1.5 times and then place a brick at 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 that pulls the mill spins?"

"ah?"

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

"It's just an ordinary donkey pulling the mill. I guess it's slower than usual?"

When Xu Yun heard this, the expression on his face became more and more puzzled.

There are many types of local self-priming pumps, and electricity or high water pressure are generally used as power sources at present.

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.

That is, the unit time—for example, within one or two seconds, the power of the mill 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 5:50 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 your morning meal.

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 if it's because he doesn't have much strength (after all, he's an actor) or because he hasn't been born in a native place, but the old man's attitude seems a little 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 like '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 position in the corner of the wall, and tied round and round to the stone bearing under the millstone.

Seeing this, Xu Yun thought for a moment, 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 courtyard 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 of escaping under the eyes of everyone.

After walking to the corner, a device similar to the size of a local computer host appeared in front of Xu Yun.

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

Other than that.

The device was still making a rattling sound.

This voice Xu Yun is not unfamiliar,

seems like

"A balance spring?"