The two were talking in a low voice, and the group of students surrounding the steam pump next to them had already begun to ask questions to the teachers. After more than a year of cultural courses, they had a basic theoretical foundation, so the questions they asked were close to reality.

A student asked why the steam has to condense in the cylinder before it is discharged after it enters the cylinder. In this way, part of the heat of the steam that re-enters the cylinder will be wasted on the re-heating cylinder and will be lost in vain.

Why can't steam condensation be carried out outside the cylinder?

This question made the teacher stunned, and Jiang Lin and Bai Zheng who were talking beside him were also stunned.

The student’s question sounds a bit funny because since the emergence of the steam pump, the operating principle of its cylinder has been.

In a one-way cylinder, one end is closed and the other end is open. There is an air inlet and drain port at the closed end. High-temperature steam is discharged into the cylinder (the air inlet is closed at the same time). Due to the principle of gas expansion, the piston is pushed to move to the other end of the cylinder (open end).

After the piston moves to a certain position, cold water is injected into the closed end, causing the steam to cool down instantly, shrink the volume, and form a vacuum.

The cylinder sealing end is in a vacuum state, and the other side of the piston (the side of the cylinder open end) is subjected to air pressure, so it goes backwards, and the condensate in the cylinder sealing end is discharged through the drain.

When steam expands (at high temperature), pushes the piston; when steam condenses (cooled water cools down), the piston retracts.

In this way, it is a complete reciprocating movement, which repeats itself, driving the pump to continuously pump water.

There is no problem with this principle. In order to form a vacuum, cold water must be injected into the cylinder to form a vacuum, otherwise how can the piston achieve reciprocating motion?

It is precisely for this reason that the so-called two-way cylinder cannot run for too long if it is really made, because both ends of the cylinder need to condense, and the existence of condensation water is resistance. The piston will slow down after several times of movement back and forth.

The result of condensation at both ends of the cylinder is that the temperature of the cylinder block drops very quickly. When fresh steam is discharged into the cylinder, it will condense due to rapid cooling, losing its "sharpness" and not even the piston can be pushed.

Bai also realized this problem after the idea of ​​"two-way cylinder" just now.

Now, they and the teacher felt a little ridiculous about the student’s question.

However, since students are beginners, the questions they ask are of course a bit naive.

How can steam not condense in the cylinder form a vacuum? You can't set up another condenser to connect it to the cylinder, which is really a waste of time...

The steam entering the cylinder must have a part of the steam entering the condenser connected to the cylinder. In this way, part of the thrust is lost, where can it be cut, and then...

Then....

Then this part of the steam entering the condenser begins to condense, the volume shrinks, and thus a vacuum is formed, so the remaining steam in the cylinder is naturally sucked into the condenser, so...

If the volume of the condenser is reasonable and the vacuum generated is enough to pump all the steam in the cylinder, then the cylinder will be close to the vacuum state and the piston will naturally go back...

Steam condensation is carried out in the condenser outside the cylinder, so the temperature of the cylinder will be maintained. As long as the insulation is done, the temperature of the cylinder will be similar to the temperature of fresh steam. Then, the heat of the steam that is discharged into the cylinder and pushes the piston forward will not be wasted.

In this way, the efficiency of the steam engine will increase many times!

The association caused by a problem made Jiang Lin, Bai Zheng and the teacher feel enlightened and thought of an amazing improvement in an instant. Such improvement is really amazing!

Jiang Lin and Bai Zheng soon thought of what this improvement means: if an external condenser is added to the cylinder to ensure that the cylinder block maintains a high temperature, then there will be no problems in the operation of the two-way cylinder.

The piston of the bidirectional cylinder moves completely against the injection of steam at the left and right ends and moves outward. There will be no condensation water in the cylinder and no water resistance will be formed.

Also, because the condensation of steam is carried out in the external condenser, the temperature of the cylinder will not decrease, so the left and right ends of the cylinder enter interchangeably, and the discharged steam can easily push the piston to reciprocate.

The problem is solved!

The great joy made Jiang Lin, who was looking at each other, excited, and the three of them shouted excitedly.

The student who asked the question, seeing the three of them lose their composure, asked a little hesitantly: "Uh...so, the external condenser is really useful to the boiler, right?"

When Jiang Lin heard the student say "external condenser", he moved his heart: "Why, have you seen... something that condenses steam outside the cylinder?"

The student nodded: "Yes, I have seen it, I have seen it before."

"Have you seen it before?" Jiang Lin grabbed the student's shoulder: "Where did you see it? Why didn't I know that the steam pump has improved so much!"

The student replied nervously: "The water pump? No, the student has seen it in Wuzhuangguan."

"ah?"

Jiang Lin was stunned when he heard this and looked at each other with the other two.

"What does this have to do with Wuzhuang Temple?"

The student replied: "More than a year ago, the students saw the Taoist priests installing external condensers for the steamer. After installing it, the effect was good."

He then added: "Using a steaming kettle to steam some raw materials is very effective, so Taoist priests often use steaming kettles, and the steam boiler cannot be stopped every day."

"Steaming kettle..." Jiang Lin felt his mind blank, "You...how are you so familiar with Wuzhuangguan?"

"Uh... the student has been raised in Wuzhuangguan since he was a child... he was raised by the Taoist priest..."

The student began to talk about his experience. He was an orphan and was adopted by Wuzhuang Temple. He then grew up in the temple and did all kinds of chores as a Taoist boy. Later, because he was smart and studious, he followed the Taoist masters to do experiments and start.

Wuzhuangguan has to conduct a lot of tests every day and uses steam to process some raw materials. Steam boilers are often used. However, under high-intensity use, even if several steam boilers are used in turn, they often fail.

If the boiler fails, the factory that produces the boiler has to send someone to the door for repair, which takes time.

Wuzhuang Temple is a very special place, especially in the experimental area, there are soldiers guarding it, so outsiders are not allowed to enter easily. Any outsiders must go through complicated procedures when entering and leaving, and have to undergo inspections. Even the boiler repairman who comes often is no exception.

Therefore, it will take some time to complete boiler repairs and home maintenance.

Although it will not delay for too long, Taoist priests who have been doing experiments can't wait, so they hope that the maintenance workers can stay in Taoist temples and be on call, but this idea cannot be realized based on the confidentiality system.

So at the strong request of all the Taoist priests, Wuzhuangguan decided to train a few Taoist children to learn how to maintain the steam boiler. At that time, if there is a problem with the steam boiler in the temple, it will be solved immediately.

Wuzhuangguan specially selected several Taoist children with good qualifications to study in the technical school, and this student was one of them.

This student followed the Taoist priest to do an experiment. He heard from the Taoist priest that the external condenser used in the steamer can ensure the constant temperature in the steamer and improve the efficiency of steam utilization, so remember it in mind.

It was probably more than a year ago that Wuzhuangguan’s steam kettle was equipped with an external condenser.

Not long after, he and his companions attended technical school and studied culture, arithmetics and theory for a year. They found that they did not mention the external condenser. They felt strange in their hearts, but they dared not ask. Now, when they saw the physical objects of the steam pump, they found that there was really no such thing, so they asked questions.

"It was found more than a year ago...you...what is going on with your Wuzhuangguan!" Jiang Lin almost shouted, "Why don't you say that after you have such good technological improvements! It's okay to apply for a patent, someone will definitely be willing to buy it!"

"Conscience! Where is your conscience!"
Chapter completed!