In the long history of civilization around the world.
water source.
It is a key word that any civilization cannot do without.
The Chinese waterwheels and water hammers, as well as the Western Archimedes screw pumps, are all tools created by ancient people for water supply.
But each of these tools is huge, and most of them 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, almost no civilization has been able to transport water on flat ground without the help of gravity.
Whether it is Rome's world-shaking ancient urban water supply system or Chang'an's hydraulic facilities during the Tang Dynasty, peaceful water transport has nothing to do with it.
For example, the water supply system of Rome consisted of the Old Agna, New Agna, Marzia, Tapua, Julius, Vergo, Antonia, etc.
The core technology of these waterways is the siphon or connector principle, which means there must be a height difference or liquid pressure.
This is also the reason why the water imported from Rome was first supplied to the fountain, because there was no way to block it.
So it is true that Rome had abundant water supply resources, but this refers to the fountains and faucets that can be seen everywhere on the streets, which are public facilities.
Residents can go out to fetch water with a bucket, which is naturally very convenient.
The water supply inside and outside the house are obviously two different things.
Except for Emperor Augustus who danced on the top of the Palatine Mountains, few people even in Rome could comfortably use water at home.
The same was true in the Tang Dynasty. The so-called convenience actually ended outside the door.
So Xu Yun was puzzled before, why could Lao Su use the water from the well in the main house?
Whether it is the principle of siphon or connector, there is obviously an unexplainable bug:
That means the amount of water injected is not enough.
A water pipe that is more than one hundred meters long and nearly thirty centimeters in diameter can be filled to one-fifth of twenty barrels of water, which is considered too much.
At the same time, there is also a very critical issue, which is labor cost.
In this era, the cost of a servant carrying a bucket ten times and walking a hundred meters was not high.
Therefore, the plan chosen by Old Su Xu must be low-cost, that is, it was tinkered with the mentality of "it costs little but can save the servants some work." Otherwise, it would be better to give a few more pennies as a subsidy.
But now with Zhang San’s words, Xu Yun’s doubts were finally solved:
Good guy, Lao Su actually tinkered with a self-priming pump!
A self-priming pump is a self-priming centrifugal pump.
The so-called self-priming means that it can automatically suck up water without adding water.
That is to say, it is similar to sitting on it and moving on its own.
Its working principle is to fill the pump casing with water before starting the water pump. After starting, the impeller rotates at high speed, causing the water in the impeller channel to flow to the volute.
At this time, a vacuum is formed at the inlet, causing the water inlet check door to open, 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 be equipped with a bottom valve, because generally the inlet of a 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 flow back to the original pool and is instead stored in the pump body, so there is no need to add liquid when using it for the second time.
Very simple principle and easy to understand.
As for the appearance of the self-priming pump, you can imagine what the air cannon in Doraemon looks like:
Just enlarge the air cannon 1.5 times and put a brick anywhere, and it will be almost the same as a self-priming pump.
"its not right"
After thinking about it, Xu Yun suddenly frowned and asked Zhang San:
"Third brother, how fast do you think the donkey is spinning?"
"ah?"
Zhang San opened his mouth without knowing why and subconsciously replied:
"It's just an ordinary donkey grinding. I guess it's a little slower than usual walking?"
When Xu Yun heard this, the expression on his face became more and more confused.
There are many types of local self-priming pumps, and the current ones generally use electricity or high water pressure as the power source.
In addition, hand pull, pedal and even water hammer can also make the self-priming pump operate.
But no matter which of the above modes is used, what is needed is an instantaneous power.
Theoretically speaking, the work done by the donkey-pulling mill is sufficient, but it takes a long time.
That is to say, within a unit time - for example, within one or two seconds, the grinding power does not seem to be enough to make the impeller rotate.
Thinking of this, Xu Yun couldn't help but have a guess in his mind:
The working principle of that self-priming pump is probably more than just the impeller pumping water.
The morning meal time set by the Su Mansion for the servants is from 5:00 to 2:00, which is around 6:00 to 7:30 in the morning.
Each servant has a quarter of an hour to eat, which is fifteen minutes.
After eating the morning meal.
'Green' and 'Dai' level servants can rest for another quarter of an hour, and then they need to do hard work, such as chopping firewood, running errands, delivering goods, etc.
For example, the unlucky guy Zhang San was sent by the old governor to pick up goods from a silk and satin shop.
Servants above "Li" can practice for two quarters of an hour, and the subsequent tasks will be easier.
For example, accompanying the gentlemen in the mansion to play in the courtyard or going out, or accompanying the master's family to visit other mansions, or repairing 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 is a male actor after all) or because he is not a naturalized citizen, but Lao Duguan’s attitude seems a bit subtle.
In words, he just asked him to get well as soon as possible and just get water during the day.
The rest are riddle words such as 'Don't sit for a long time', 'Try to lie down as much as possible'.
Of course.
The surveillance that should be given will not be relaxed.
Later, accompanied by several servants who went to chop firewood, Xu Yun returned to his small courtyard again.
Crunchy——
Just entered the hospital.
Xu Yun saw a blindfolded black donkey slowly pulling a millstone.
The bottom of the millstone was simply modified. As the millstone rotated, a piece of animal was continuously pulled from a certain direction in the corner and tied in circles to the stone support below the millstone.
Seeing this, Xu Yun thought for a moment, then glanced at the servants who were accompanying him, then turned and walked towards the corner, the bells on his feet still tinkling.
The few servants did not stop him, but went about preparing the tools for their own work.
After all, the height of this courtyard wall is nearly one foot, and next door is the courtyard atrium.
As long as Xu Yun doesn't know how to walk through walls, there's no way he can escape in front of everyone.
After walking to the corner, Xu Yun saw in front of his eyes a device similar to the size of a local computer host.
The rope seen on the millstone earlier was slowly pulled out from one side of the device.