On the fourteenth day of the first month of the eighteenth year of Chunxi, today is a holiday in the Special Administrative Region.

According to the rules of this era, the three-day carnival is a folk custom that has been postponed for hundreds of years, and the most lively of them is the lantern festival on the night of the Lantern Festival. Although there is a word "special" in the Special Economic Zone, Mao Geng has always followed the customs of the locals, so all departments of the Special Economic Zone, including all workshops and companies, have a three-day holiday, and the Special Economic Zone has also arranged all kinds of strange lanterns to add atmosphere to the festival.

Of course, there are many people working overtime in the Special Economic Zone today, according to the plan, a party will be organized on the evening of the fifteenth, Mao Geng had such an idea last year, but then he gave up, this year there are many traversers to join, everyone is a total, the Spring Festival Gala in later generations is a reserved program that the people like to see, and it doesn't hurt to come to such a play in the Great Song Dynasty. This is of course a good thing, but this matter has its own chief director Lao Qiu Zhang Luo, Lao Qiu is leading a group of people who are busy rehearsing, and Mao Geng only needs to be an audience member at that time.

At this time, Mao Geng was in the steam engine workshop, guiding a group of people to test the latest three-expansion steam engine, now Mao Geng is personally responsible for the project is so several, the steam engine project is one of the most important, before that, the steam engine manufactured in the special zone are single-cylinder steam engines, for the traverser, the shortcomings of the single-cylinder steam engine are obvious, technology upgrading is inevitable, the three-expansion steam engine is the inevitable choice of ocean-going ships, and the three-expansion steam engine technology must be overcome.

That's right, the steam turbine is the first power take-off machinery in Mao Geng's hands, however, the steam turbine is too large at the beginning, usually have to be equipped with a reduction mechanism, such as the gear reduction box, at first Mao Geng did not take the gear reduction box seriously, but practice has proved that in this era, the difficulty of the gear reduction box is not ordinarily large, although Mao Geng forcibly created two gear reduction boxes, but the pain is that the failure rate of these reduction tanks is not generally high, so that the ship is open, the reduction of the box has a problem, and the steam turbine has to be stopped for maintenance. Fortunately, Mao's steamships are generally hybrid, and there is a problem with the power of the steam turbine, and there are sails, which are slow and slow, so that they will not be unable to drive.

Three-expansion steam engine, in fact, in principle and single-cylinder steam engine is not essentially different, three-expansion steam engine, as the name suggests, it is a series work system of three-stage expansion of steam, its point is to squeeze every trace of energy of steam, so that the waste heat of steam is exhausted.

The three-expansion steam engine is composed of three increasing single-acting cylinders, and the high-pressure steam output by the boiler first pushes the first and smallest piston to move to do work, in view of the fact that the steam discharged by the first-stage piston is still in a medium-pressure state, it is a pity to directly discharge or condense, so the human method is to let it pass into the second-stage that is, the medium-sized piston chamber, and push the second-stage intermediate cylinder to do work. The steam discharged from the second stage cylinder still could not be wasted, so the shrewd human beings made the third stage, and the low-pressure steam discharged from the second stage passed into the third and largest piston chamber to push the third stage piston to do work. Until the waste heat is exhausted, the steam discharged from the third-stage piston chamber really has no value of work, and then it is condensed into the condensing device to supplement the boiler water as condensate to realize the recycling of "water-steam-water".

This is the three-expansion steam engine, which is the pinnacle of the steam engine. Since it is the pinnacle of work, its complexity is certainly not comparable to that of a single-cylinder steam engine, for example, its crankshaft, which is not trivial in its machining difficulty.

As for the design of the three-expansion steam engine, although it is not difficult, but for Mao Geng, after all, this is not an unattainable mechanism, it is nothing more than a piston crankshaft connecting rod mechanism and a sequential air intake and exhaust mechanism. The four-link mechanism is the most rare part of it, but this thing is not difficult for Mao Geng at all, and Mao Geng also has a great advantage, that is, he is not fighting alone, Mao Geng has a constantly improving Mao team, and the combat effectiveness of this team is obviously getting stronger and stronger. Sometimes, as long as Mao Geng gives a finger, the disciples can independently prescribe certain techniques.

The most important thing is that technology is a money-burning business, but Mao Geng is not bad for money, with money, the progress of the opening is guaranteed. For example, in order to open this three-expansion steam engine, Tan Xiaochun led a group of carpenters to make six sets of wood models alone, and the last set of models of the three-expansion steam engine is a one-to-one size, which is very ornamental to run, the intake and exhaust ports are opened and closed sequentially, the piston is reciprocating, and the crankshaft rotates, which is orderly, and it looks almost no different from the teaching model used in colleges and universities in later generations, and the piston room is naturally dissected. These models are used to simulate and verify all the movements of a steam engine. Among them, the first five models are all failed models, but it must be said that without the first five models, there will be no last successful model, failure is the mother of success, honestly!

After the boiler is fired, it is not possible to obtain high-pressure steam in a short time. The waiting time was a bit long, so Mao Geng pulled Zhao Yuchun to the technical room, made two cups of tea, and waited while drinking tea.

The set of models was placed in the technical room, and a layer of varnish was painted on it, Zhao Yuchun stroked this set of very ornamental models, and was very admired:

"Hehe, it's so exquisite! And very precise! There is no computer simulation, and it is not difficult to beat Maote at all, this simulation method is really good! ”

Mao Geng smiled:

"What's so strange about this! In the later generations, the Celestial Empire built nuclear submarines, didn't they first build a wooden model! It turns out that this method of making a wood model is very powerful, and I just plagiarized it, and the copyright can only be said to be a copycat version. Hehe! ”

Mao Geng said that this is the true story of later generations, saying that the Celestial Empire has never done a nuclear submarine, and even the nuclear reactor has no concept of how to place, so some people proposed to make a 1:1 model of the nuclear submarine first, making this model is a big project, for a time the busiest nuclear submarine development department is actually a group of carpenters, this group of carpenters is exquisite, the model of the nuclear submarine is completely made of wood in a 1:1 ratio, it has realistic internal organs, and even the telephone inside is made of wood, It looks like it's lifelike. Later facts proved that this practice was simply a stroke of genius, and it was said to be a crucial turning point in speeding up the pace of nuclear submarine development.

Hearing this classic story of later generations, Zhao Yuchun said with a smile:

"Maote is right, this method is very powerful, whether it is our ironclad car or tank car, all of them are wooden models to open the road, it is necessary, haha!"

Mao Geng smiled, and then said:

"There's a long way to go! At this time, the boiler has to use copper, and many places where the boiler is made with steel riveting technology is not enough, not to mention the water tube boiler technology, and I don't know how the British used riveting technology to make boilers in history, alas! It seems that among our gang, we only know welding technology to make boilers. ”

Zhao Yuchun only smiled bitterly, in the 21st century in later generations, welding technology is not good, fools will use riveting technology to build boilers, and even if you want to use riveting technology to build boilers, no one dares to use them, and the Safety Supervision Bureau will find you trouble.

However, Zhao Yuchun didn't think there was anything difficult about welding technology, so he patted his chest and said:

"Maote, riveting is a transition technology anyway, let's just weld directly, the welding machine is simple, it is a transformer, as for the welding rod, it is simpler, a steel core, brush a layer of coating on it, and then you can sneer at welding. Nowadays, electricity is not a difficult thing, the energy efficiency of mechanical energy into electrical energy is low, anyway, it can be used as electricity, with electricity, you can use it as a welding machine around two coils, we can weld, whether it is to build boilers, ironclad warships, ironclad chariots, it is a piece of cake. ”

Mao Geng looked at the guy in front of him who was born in agricultural machinery in the future, and said everything so simply, is it that simple!

"Lao Zhao, do you know the ingredients of the coating on the welding rod? I don't understand the truth, how can it be as easy as you say! ”

Mao Geng used a lot of welding rods in later generations, but he really couldn't understand the composition of the coating of the welding rod, and it seemed that the coating was very particular.

"Don't hide it, I have a friend in my later life who makes welding rods, a better coating, it seems to be titanium oxide, ordinary welding rods, the coating is iron oxide and what feldspar, marble powder, make some water glass bonded into the coating, and then dry it, it is the welding rod, in my opinion, there is really no technical content."

"Well, iron oxide and stone powder are easy to find, but what about water glass?"

"Hehe, it's easier to produce water glass, just after the reform and opening up, there is a contractor in my hometown to produce waterproof materials, the key is to produce water glass, guess how people produce, quartz sand and soda ash are burned vigorously in the furnace, and then there is water glass. Haha, people have made a lot of money with this hand. ”

"Oh, cow!"

Mao Geng sighed, the self-employed in later generations really dare to do anything, and the spirit of copycat is both admirable and frightening.

Just sighing, Tan Xiaochun pushed the door in and handed Mao Geng a flying pigeon biography.

Mao Geng saw it, and knew that it was a flying pigeon biography from Lin'an Wenyuan, the problem was that this was a flying pigeon biography with a high level of secrecy, and he didn't know what happened to Lin'an, Wenyuan actually wanted to use this set of high-level passwords.

Mao Geng had no choice but to say hello to Zhao Yuchun and said that he had to go first, so he went straight to his special office.

After returning to the office, finding the codebook, and translating the contents, Mao Geng was stunned on the spot for a while.

What is the situation! Could it be that Zhao Tuan took the wrong medicine, how could he suddenly think of touring Taiwan in the south!

If Zhao Tuan really wants to come to Taiwan, will it be a curse or a blessing for himself to cross the world! Could it be that Zhao Tuan really intends to pass on the throne to Zhao Lu? No, according to Zhao Tuan's temperament, it seems that he can't do such a thing as abolishing the prince for no reason.

It seems that the Emperor of the Great Song Dynasty is not popular to go out to patrol, okay, just when the emperor will really tour the south, we have to make a little preparation, for example, which should be seen by Zhao Tuan, and which should not be seen by Zhao Tuan, we have to have a plan.

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